Just be friends. Whether you're 15 or 50, life is too short to be breaking up and getting back together with the same person over and over again. Plus, you said it yourself that she's the one that initialises the split every time. So break out of this cycle once and for all. When it comes to anything in life don't make the mistake of repeating the same pattern over and over again and expecting the outcome to be different. I get that you care about her feeling bad, but don't go along with something that you know is probably a bad idea because you're worried about feelings getting hurt. That's for them to deal with. You are not responsible for managing someone else's negative emotions even if you are close.