is it rape?

at sixteen I had been with my boyfriend (now ex) for nine months. he'd been trying to have sex with me the whole relationship and I always said no. one day he came over and he took me in to my room and started kissing all over me and I kept saying no. I pushed him off me and he said, "I thought this is what you wanted." he kept persisting, repeating "just let it happen, baby." so I did. I let it happen. I didn't try to get him off because as a 5"3 girl, getting a 6" solid male off is a mission. I just let him have his way.

he left me two weeks after that without any explanation. I'm 20 now with a son and a healthy relationship, but after telling my fiancee about my first time, he said that it sounded like rape.