Stress in relationships?

I have been with my boyfriend for almost 2 years and now that I've had a job and work almost everyday I feel like I don't want to be with him like I get easily annoyed. I'm not really interested in anymore too. I hate feeling this way...it's on and off too. When he talks about living together I kinda get scared like just a week ago I was happy about that subject..now it's weird.. Even my eating habits changed. Someone help me save my relationship please?? I don't want to break up with him.