am I just being paranoid and sensitive??? 😔😔

Me and my so of 1 year and a half, well we always get on GREAT, we have an AMAZING sex life, like, to the point where we both can't ever keep our hands off each other. Or even watch a movie to the end without intercourse happening quarter way in. He ALWAYS compliments me. But this last week things seem different. He seems more distant. And not as all over me. What happened was, well, to start off we have been having wee arguments more so last few weeks over a situation we found ourselves in and I have constantly every single week found some reason to end it. Like just sending him a text out of the blue that I'm done. When I had done he was chasing me down. At my door. Ringing texting flat out. Now he said it's just getting boring and it's the same thing every week that he's becoming unsure of me. That I need to stop it. So that understandably I'm sure has made him back off. But he's a sex maniac from what I know of him, yet this last week he hasn't wanted to have sex with me. He has a rash around his thighs. He said only happened after we had sex last week. And he doesn't want to have sex until he gets it checked. He says he's only had sex with me. And I've only had sex with him. But he's making me feel like he secretly believes I've been with someone. Like he will say noooooo I don't want to have sex with you. How about I just play with you and you give me head. 😕😐😐😐....... Even when he kisses me it isn't as long, or as passionate. Like he's pulling away as he gets aroused. And he looks at me different in a way I can't explain. He keeps constantly trying to reassure me he doesn't  think the rash is my fault and that really is why he won't have sex. That he doesn't feel anyway different about me. But it feels in my gut like he does.