Feeling dum...

When my bf got home from work today i was asleep it was 2:30 am i woke up to him washing dishes witch i was happy about but its pretty weird considering the time then we lay down and he says he wants me so we start doing stuff and he cant get hard at all his face looked worried and i just felt dum it took like 20 mins just to keep him hard :( 
​Idk why he was being wierd and a few other little lies were told to me i feel like hes cheating but i just dont know.......maybe he just tired of me? Or what idk but its never been that hard to make him hard...... I just feel dum..?