You could dump him, but if you care enough for him to come here and ask that might be too hard for your heart to do.
However, this isn't a good sign for your relationship, and you should take some time and consider how things progress. I would definitely let him know that you know what his friends are saying and that it concerns you. See how he reacts to your plea for empathy.
Also, consider why his friends are suggesting that he break up with you. From your question, we have no idea why his friends want to him to leave you, and perhaps you don't know either. If this is the case, try to find out. It is possible that they simply don't like how infrequently they get to spend quality time with your boyfriend.
Allow some time to pass and your course of action will become apparent. If his friends wont quit, and he wont shut them up, then you should go find a man that would.