Talking dirty

My boyfriend doesn't want to sext anymore because it all of a sudden makes him feel uncomfortable and it's weird cuz we've done it in the past like all the time and now he just wants to stop and doesn't tell me why. I'm trying not to bug him anymore, but it sucks cuz sexting was fun . Has anyone had the same problem? If so did you try to confront your SO about it? How did you deal with the situation ?