Am I wrong?

About a year and a half ago, in my freshman year I was in a fwb relationship with a junior. He was driving me back to my house after we had hooked up. He was trying to convince me to get him roadhead and kept trying to convince me to do it even after I said no. At this point I wasn’t feeling comfortable and just wanted to get out of the car. He then put his hand on my thigh and began to finger me. I didn’t want this but I still pretended I was into it, even though I wanted to cry. Is it technically sexual assault even though I pretended to be into it and am I wrong to begin to tell people this late after the fact or does it just look like I’m trying to make him look like a bad person?