Feeling rejected :(

My boyfriend and I used to have an incredible sex life and we really enjoyed pleasuring each other and it was also a lot of fun for the both of us! However recently since he has returned to work, he has no interest in me at all. I've asked him once in the last month if we could have some 'quality' time together and he simply said "I'm far too tired and I haven't got the time". Every time I try and initiate something or try and get him turned on he just pushes me off and pushes me away.  I feel really rejected and unwanted :( am I just being silly?