Bleeding and Discomfort after marturbation.

I'm a virgin and the last two times that my boyfriend has masturbated me I've bled. The first time that he did it I didn't feel the blood at all, I felt werid a little bit later and when I went to the bathroom and there was a lot of blood and I knew it wasn't my period. I thought that he broke my hymen, don't know if I'm right obviously. Also, that are hurt like for two days after, then it went away. After that, I thought that I wouldn't bleed anymore because well, he broke my hymen. But, yesterday he did it again and when I got home there was blood but, very little in comparison to the last time and it hurts a little too now, less that the last time. What's happening?