Advice

I just moved across the country with my long time bf to help care for his sick mom. We've been here a month and every night he that he goes out he's always gone for hours and never tells me where he goes. He has an ex gf that was serious before we started dating and I can't help but think that he's going to her. And when he gets home he's never in the mood for sex when he use to be all over me. I'm just really worried I left my entire life behind for a cheater.