Here you have a girl whose lost and confused. I have lost my friends, my hope, and now... I think I have entirely lost my mind. I think I have become immensely obsessed with my fiance. It's like I absolutely need him now. Like if he is online and then gets off before realizing I messaged him I get depressed. I even think because I'm so devoted to him I lost the support of my friends. I think I have caved in and become a monster due to my obsession!
I just can't see the light, but I don't want to lose anybody. I don't want anything to happen, but it seems it is to late. Please, what do I do to stop myself from letting me cave in?

I have a friend whose story seems similar to yours; she's been ditching and insulting all of her best friends to spend every second with this control-freak boyfriend of her's... and she's pretty much already lost me. I am extremely hurt and angry with her, but I would gladly listen to anything she'd have to say about it.
Although your story is similar, it doesn't seem like your fiance is driving you to do these things. You're probably, for whatever reason, afraid of losing him. All the advice I can give you is to talk to your friends about it. Like me, they would probably listen to your apologies and whatever you have to say for yourself.
Talk to your fiance, too. Engagement and marriage is about trust and communication, so take advantage of that. Ask him what you think you could do in order to incorporate your friends in spending time with him.
There's always a solution; you won't lose yourself unless you're willing to. :]

I'm the same way actually. I get kind of sad when my boyfriend hangs out with other people. Because I"m off at college and he is a senior still in highschool. So we don't live in the same town - we're about an hour apart. So we see each other practically every weekend. But during the week I don't get to see him. So when he says he is hanging with other people or signs on aim and signs off without messaging me I get sad sometimes. I know I can trust him - I trust him with me life. But I still get sad because I can't be with him all the time you know? I love him so much that I need to be with him and I need to talk to him. Sometimes I feel like I can be overbearing but he just takes it in stride and goes with it.

Don't let him become the only thing you live for- everyone has faults.

You must be cautious not to reach the point you've reached.

You must remember that depending on a single person may be a disastrous situation. You must be careful not to burn your bridges with friends and family specifically for one other person. In the long run, those who have taken care of you for years will win out over someone who you are in love with.

You may attempt to apologize to the friends you've harmed. It would probably do a lot of good. Your boyfriend needs to realize that you are being overly obsessive and help you with that. He should never be trying to pull you away from your friends.