The real question is what do YOU want to do? You know what will probably happen if you get back together again. Take some time to really think about it. Write about it. Think about what you want out of a relationship, and if you want one right now. Do not let her pressure you into a decision.
If you want to make a change, do it for yourself..not because someone else demands it.
You deserve to have a happy, supportive relationship. One where your partner accepts and loves every part of who you are. The trick is learning to accept and love yourself first.