MEN!!!

Is it normal for men when in a relationship with someone to be friends on Instagram with a bunch of naked woman who thinks they are models? And like there posts? In a past relationship ship this guy cheated on his girlfriend through email and then meet and had sex with them. This only happened once that I know of and he’s been totally honest to me about it. When that girlfriend found out she went through his phone and email. They broke up but now he doesn’t trust his current girlfriend at all because of it. I really think he’s not going after them we are just in a rough patch right now and I’m feeling insecure about are relation ship. And just being stupid. Things are just really stressful and I work way to much and don’t ever get enough sleep and he’s busy with college and when he gets home he wants time to his self which is understandable. I Just feel really lonely and feel like I can’t talk to him anymore. Lately it’s like I can’t do anything right.