Relationship issues

My boyfriend and I have been together almost a year, and lately I feel as though he has become more distant. He isn’t in a rush to call or text like he usually is, and he even said he wants time to himself. We spent the weekend together and he had work but normally we would always talk or he would let me know he’s going to be away from his phone for a while and play the game or something. I didn’t text him back for one hour today and he was asking what I was doing as if I was being sneaky. Then he disappeared from 6pm-10pm after telling me he planned on working out soon. I finally call after 10 and I asked what he was up to and he said he worked out, played the game and just layed in bed. But normally he’d be anxious to call. I’m on my monthly so he thinks I’m just being emotional. But I feel as though he’s tired of me. I could be wrong, maybe he truly does want space because we spent a long time together but I’m not sure. We spoke on how big we are about being loyal to our partner yet I feel like there is something I’m not being told. He’s not the type of person you can just ask this question. I asked if he was cheating and he got frustrated saying “why would I be spending time with you and your mom and smiling in your moms face knowing I’m cheating?” And “why can’t I just want my own space. I spent the whole weekend with you and spent the last of my money to come see you.” Which i appreciate. All I wanted was at-least a text saying that he was gonna go MIA. It makes me sad that we no longer communicate about these things, or we’re at the point where he doesn’t feel the need to inform me about things or makes excuses and tells me I’m annoying. I don’t know if I’m just having anxiety or truly having a gut feeling that he’s being dishonest. What should I do? Will the truth reveal its self? Should I okay my role until then? Do I distance myself?