Is it me? Please help!!!!

When my SO and I first started dating he spent most if his time with me. But for the past few months all he has wanted to do when spend all most of his time with his friends. I really only see him on the weekends and that's just in the morning when he wakes up a and at night when he's ready for bed. And when he comes home he plays the video game all night long. Still no time for me. I asked him why was he spending more time with them he just said he doesn't see what's wrong with it. I've been crying for about 2 hours now. I'm just so heart broken.