I agree wuth remar 100%!
Being obsessive is not healthy for anyone involved, and it CAN lead to some really destructive behavior. You've already purposely interefered in your last friend's friendships, that's not cool. You don't HURT the people you are claiming to care so much about by taking away other people in their lives that they enjoy. Sounds like you're very possessive and want to be THE only friend or THE only love interest, etc. It's HEALTHY to have a bunch of friends.
I agree, please ask your parents to help you find a professional you can talk to about this. Best to you!
Hey there....don't worry. I have a similar issue in a way. I'm obsessed with one person that means more than my life to me..Let me tell you this...if you aren't sure about how much they feel about you, try to loosen up. If you feel a pull towards them, it's good to be with those people, obsessive really can show you care...but try to limit yourself. If you get carried away, it can eat at you, make you do foolish things for yourself and them. I've made those mistakes. It's hard to cope with it, I know. But you have to just try to have a great time with them...and loosen your grip on the people you aren't sure with. The ones you don't think that will last. Just try to stay calm and collected, and be there for them. Being kind and always caring shows how much you love them. I hope my advice has effected you some how. I hope everything goes well for you. Good luck.
I think getting in to therapy would really help you. Can you talk to your parents or school counselor about how you feel?