Why does my jaw hurt?

if you bit something hard thats probably why

or you have a toothache or you have a tooth growing

it could be from clenching your jaw from stress ! try holding cold water in your mouth n ice your face ok! try n get some rest :)

if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.