My boyfriend said I chinge my teeth. At nite it like im eatting something dose that come from stress please help?

Getting a nightguaed. A lot of people grind/clench their teeth at night due to stress. Relaxing & calming yourself before going to bed may help. You can get custom made nightguard from your dentist & that can help.
Definately can be! It's a common thing to see. If you are grinding at night, you can get resultant headaches, sensitive teeth and jaw pain and the noise it makes can be annoying to a sleep partner. Stress is a big factor!