Bleeding after being fingered twice by boyfriend in two weeks. he did it hard and i was not very lubricated. what may be the problem?

Vaginal trauma: Lack of lubrication and aggressive foreplay can cause local trauma to the vaginal wall and result in bleeding. Get an exam if the discomfort and bleeding persist. Talk to your boyfriend about being more gentle. He may not realize that he was being too rough. If he did it intentionally, you should address the aggressive behavior.

See G.Y.N. doctor: Some part of vagina or cervix got traumatized and now is causing bleeding .YOu need to be examined by doctor -G.Y.N. to assess the bleeding and injury to the part,also get the proper treatment .