I think you should discuss this with your bf, because the longer this goes on, it could cause problems one way or the other.

Read some of deepsouls suggestion first though, so you're better equipped to talk about it and not scrambling for words and coming across the wrong way.

If he gets pissed, remind him that you looked into it and went to him with it, so could work on it together.

Clearly something you are concerned about, and whilst DeepSoul may be on the right track (I disagree :P), it's something you should talk about with someone, like your boyfriend, because you'll probably end up feeling guilty from keeping it from him.

Goodluck.