Sexually assaulted TRIGGER WARNING‼️

So when I was a freshman in high school I was sexually assaulted by a senior but I’ve always kind of put a really grey line around it because I willingly went to his house in hopes that he would ask me to be his girlfriend. He ended up performing a sexually act on me and I started tearing up and asked him to stop multiple times he didn’t end up finishing, he stopped after what I think was my 5th crying stop. I put a Grey line around the situation because he did end up stopping eventually and I willingly went to his house but the situation messed me up because he took something from me and I felt violated. Once he graduated he messaged me a year later to apologize. He said he felt sick about what he did to me. I decided to forgive him because I didn’t want to dwell on that situation forever and I wanted to move on with my life. I didn’t talk to him again after that. Fast forward five years later. I graduated, moved out, lived my life without ever really thinking about the situation until 4 days ago when he added me on Facebook. I’ve now had 3 dreams about him. One dream each night about hooking up with him and I feel sick. I have absolutely no clue why I’m having these dreams but it makes me feel like a fraud. Like what happened to me 5 years ago doesn’t matter because I’m having dreams of literally consensually hooking up with him. The dreams are really good and in them I’m really enjoying myself and then when I wake up I start crying and even threw up after one of them and I don’t know what to do. I don’t know why this is happening but it’s driving me crazy.