no sex?

Emily
Me and my boyfriend used to have sex every chance we got. I recently moved in with him, about 2 months ago, and ever since then we hardly ever do it. I had to work until 1 this morning and while i was at work he talked a big game about how horny he was and me waking him up when i got home to have sex, i get home and he doesnt want to do it anymore. He knew it was the last chance we had to have sex for about 2 weeks due to him going out of town for work and my period starting. It honestly makes me feel like he's getting it from someone else since he seems just fine not getting it from me. Am I over reacting or should i be concerned?