Should I tell her?

So there’s this guy that I met a while ago. We had a thing going on and we’d often mess around and have sex. Okay that’s all well and good until he caught feelings. I didn’t feel the same way and I expressed that to him. Fast forward a couple weeks and I start to feel the same way. He got a girlfriend in the mean time (kms) we go through a whole bunch of bs and somehow maintained our “friendship” But that “friendship” includes exchanging nudes, sexting and occasionally having sex. HE HAS A GIRLFRIEND! I feel terrible but you really can’t help how you feel about someone. I just really want to tell her and get everything off my chest. If you were in this situation what would you do? Please no judgements I hate myself as it is