I’m sad and angry at everything

I knew this girl for a while and absolutely fell in love with her, and I feel like she lead me on for a long time before eventually telling me she doesn’t like me the same way. Every few months she would reach out to me when she’s having a rough time in life and I would help her through it (I know I shouldn’t), and then when she feels better she leaves again. I feel so used. it’s been 8 months since the first time we split and I still think about her all the time. I want to reach out just to tell her how much she fucked me over.