PLEASE TAKE THE TIME TO READ THIS AND HELP ME!!

OK I have this friend that I've dated a fue times but we cant seem to stay together... I really care for him a lot but he has a bad abbet of cheating! I stopd talking to hm 4 about a month and tryd to get over him (that didn't work) but as soon as I came back from my summer trip... I get a call from him ad he says how sorry he was 4 all the bad things that he did and he wants to make it rite... so I agreed to go out with him this weekend and try it agen

Well yesterday I found out that he has a girlfriend!! my heart is broken agen!! My friends think I should go out with him and do the same thing that he is doing to me and make him feel the pain... but I don't know how... and I don't know if I want to... I really love this boy sooooooo much... what do I do??