I think i don't love my boy friend anymore but i can't tell him?

You will cause yourself some pain and suffering unless you have an open, honest conversation with him about what he is doing. It will be on you to let him know how his actions and behaviors are affecting your relationship. Be calm and fair in talking with him. Be sure to hear him out, but be firm in expressing what is going on in your head about your relationship. Dialogue is important in settling things not just between the two of you, but also in your own mind.