I just need some advice.

Nobody likes to have their heart broke, you feel like you are going to die...She sounds like she is your first love as well as your first sexual partner. That makes her special to you. We all have had a first love, some are memorable and some...well, lets just say that there had to be a first time, before we can continue on. By what you've said, she sounds like she wants to keep you around in case her other first doesn't work out, (she needs someone to fall back on until someone better comes along)this could happen 5, 6, 10 times..as long as you continue to let it happen. You can say that this is alright, but getting your heart broke every other week or day, can be very trying to say the least. She is not going to change how she feels about you, you can't change her. You can only change yourself and how you react to situations. It is said that Changing the way you respond or react to someone, will eventually change the way they act towards you. Give yourself a chance to meet someone who is going to like you for who you are and respect your feelings. Kick her to the curb, go through the pain, don't go back...always move forward. You will meet someone who is much better than the "heart breaker". She loses because she never took the time to get to know you. ( Hint)She will lose in the end, because she will never let anyone get to know her either.++