As your boyfriend, it is his job to be bothered about your feelings! Don't hold back, be honest with him and tell him how you feel. He'll be able to help you
If Your Boyfriend Asks You What's Wrong When You're Crying, Is It Alright To Tell Him? Or Would It Annoy Him? Also, Would It Be Bad To Cry In Front Of Him? I Wouldn't Want To Bother Him With My Feelings...
Sharing feelings with your bf won't bother him but you crying without him knowing the reason will make him more annoyed. Tell him the way you feel and what's making you cry and I assure you that he will be more than just glad to help you feel better. Trust me.