An ex-girlfriend from 10 years ago says I coerced her

I don't know what to say. My girlfriend from my teenage years, who was a neighbor and a classmate is now claiming that I raped her. I can’t even remember clearly. It wasn’t a healthy relationship. I remember we were both immature, but I was definitely more so than she was. I remember that I wanted to have sex, and she didn’t want to. When I would bring it up repeatedly, she would get upset, and I would back off. When we finally had sex for the first time, I had stopped insisting. I even remember asking her if she felt comfortable, and she said yes, she said she was sure. Was she lying?. We didn't have sex until a year into the relationship. She says I coerced her. We eventually broke up because she moved out of state. I’ve seen the messages she sent to our former classmates, her messages were full of resentment and hurt. One of my friends said If she hates me this much, something must have happened, but I don't know what it was. I’m lost. I just want to drink. I can’t digest this. We are both 27 now. The other friends who showed me the messages acted like it was no big deal. They didn't realize how much this would mess with my head. I already talked it over with my wife. I never thought someone could hate me this much. That I could be labeled as a rapist.