There is this guy (David), he’s 18 and just two years older than me… he’s a real good friend of one of my best friends (Rachel) but I mean they’re just fiends like brother and sister there is no way they will be like a couple some day…
David is known as a “player”, the kind of person who’s just not capable to be in a serious relationship. One day he calls Rachel and tells her he’s interested in me and asked her to introduce him to me so she did… we began talking and became really close but nothing happened for like 7 months or something like that 

He called my closest friends and asked them information about me, like things I like to do or things I like when people say to me, I thought it was sweet but I didn’t understand what the hell was going on inside his mind because he tells my friends and his friends that he wants to be serious with me and that he really likes me but with me he doesn’t do anything about it, like he’s waiting for me to do the first step (LIKE THE GIRL IS GOING TO DO THE FIRST STEP!! ).
So finally one day he invited me over to see a movie but with my stupid luck it was the same day as my best friend’s birthday (Jess). I told him that I was sorry but I couldn’t miss my friend’s birthday. Anyway at the party it was just girls so we began to talk about couples, boys,… and one of my friends (Emily) didn’t stop talking to me about David and she asked all this questions like non stop! But I thought that she was just curious as a good friend…

The next day at school I saw that David and Emily became close and he like started to ignore me. Rachel told me to go talk to him and ask him what’s wrong but I was so mad that suddenly he started to ignore me so I told her that if he has a problem he should tell me and not start ignoring me like a little baby! After 3 days he still ignored me and he became even closer with Emily, I decided to be the bigger person and go talk to him and we got into this stupid fight, he told me that he wasn’t ignoring me but that he felt like it was always him that came talking to me and stuff like that and that I like didn’t care about him and never went to talk to him so he was waiting for me to come talk to him… after a long conversation everything went back to normal but I noticed that he didn’t feel the same way about me (before the little fight that we had he always called me like mon amour and my sunshine and he told like every second that he thought I was the most beautiful girl and that he loved my smile and like in the middle of our conversation just to make me laugh he would ask when are we going to get married? And he like made me promise him that I will marry him in 10 years no matter what and just stuff like that…, don’t get me wrong I’m not that stupid and I don’t believe every gut that tells me stuff like that but there is something about him that I just knew he was serious, I mean like the fact that I was the first girl that he wanted to be serious with and really felt something for and he went out with A LOT of girls before me so…) but like I said after our little fight he wasn’t like that anymore and I really missed the old him .

So like 2 days after we had the fight I come to school and Emily comes to me all hysterical and she tells me that yesterday he send her a message that he will come over her house in like 1à minutes but she was sure he was kidding and the next thing she knows he’s in her room and he kissed her and now they were like a freakin couple!!
I was sooo mad and I didn’t know what to say! (Emily isn’t really hard to get if you know what I mean … she has a reputation of a slut and if a guy just wanted to have some fun and like not be in a relationship he knew that Emily is the girl he could go to…).
The day I knew they were together he send me a message ‘’hey what’s up’’! (like nothing happened! ) I thought I was going to kill him and I just wanted to send him back a message and just yell at him and tell what I think but my friends told me that he’s not even worth it and just send him back ‘’fine’’ just to let him see that I don’t care about him anymore (witch is not true )

Anyway after 3 days Emily broke up with him and begged me for a second chance, the thing is that I don’t really care what I should do with her but now when I saw David in school he maked like eye contact with me but it’s like he was afraid to talk to me because he knew that what he did was wrong and that if he start talking to me I will start yelling at him… and every time we passed each other he looked at me but he didn't say anything…
I know he’s a jerk and I will never go out with him now but I just wanted him to talk to me, I wanted to hear what he has to say, like why did he do it but I wanted him to come talk to me and not that I will go talk to him because he did something wrong here and it’s him that needs to come talk but he didn't … all he did is just look and make eye contact…

After two weeks Emily and David got back together and he broke up with her two days later... people say he only got back together with her so that he could break up with her (like a revenge or something... ). The truth is that when they got back together I really didn't care (that's a good thing right? It means that I'm over him but still every time I see him I want to talk to him!
Now I hear like some of his friends telling him he should go talk to me but he doesn' .
And I think that Rachel is trying to get us to talk to each other again but I'm not sure .

I just want to forget about him but I don't think I can do that if I don't know why he did what he did and he doesn't come talk to me and I'm so confused and don't know what to do!! PLEASE HELP ME

Tell him everything you can think of and as your friend goes it'll all run its course!