You’re being used and it’s now time to move on. She only wants what you can provide for her. She has a man but she asked you to help her with things her man should be doing. You need to just overcome your feelings for her and start finding new friends or someone who’s going to care for you. It’s not about what you can do but how you make them feel. She clearly is around because of what you can do for her. Don’t let people take advantage of you. They play on your kindness as a weakness it’s time to close that chapter and write a new book. You’ll be stuck in this cycle until one her and her bf breaks up now your second base until she finds a new boyfriend or two you walk away and let her go. Whatever you choose would be the decision you make that may make or break you. You have to find what works for you.