I have been with my fiancé for a year and 5 months, and he means the absolute world to me, but I have serious trust issues. I try not to be the way I am with him, but I just can't help it :( Within a few months of going out, I caught him chatting up this other girl, and ever since then I've never been the same person.

:( I love the guy to bits, and I wouldn't give him up for anything in the world but times are getting harder :(. I'm a very protective fiancé with him because I know his past and I'm scared of losing him! But I have caught him out on chat sites, and is chatting up other girls, and I know he's lying about it, because he get's all defensive, and that and gets in a mood, like he's angry he's been caught! When he's in his moods I get the short end of the straw.

I just want to be the perfect girl for him. Someone help me in how I can do that? Please :( cause I'm useless :(

No you are not useless, you just have given your 16 year old heart to a guy who doesn't appreciates you, or know what to do with what you give him. He is a taker, and you feel useless because you are helpless to change him, yet afraid to let this lying cheater go.

Until he changes you will be jealous, and insecure, and that's not likely to happen, so you will get hurt again, and again, until you say enough of this crap. I bet you are a great person, but I also can bet he is not. Sad, because I think you deserve better, and can do better.

Your young heart is leading you down a very painful path, and when you tolerate bad behavior, you get more of it!