Did you ask him why he did that? I really can't imagine what good reasons there might be for giving you a knife for Valentine's. Then again, I don't know the dynamics of your relationship either. Maybe he was misguided. Does he do other things that make you feel this way? What about supportive things? I think you need to evaluate the relationship, but not just on the basis of one thing like this. He very well not be right for you, but I don't have enough information to advise you further.

That's too bad, though, that he gave you a gift that triggered you and has caused you to feel bad.