Boyfriend in bathroom for wayyyy too long

My boyfriend and I have recently went through some shit where I don’t trust him. He goes to the bathroom for long periods of times and says he’s just “pooping” or taking a damn shower. But he goes in there for 30 mins to an hour and I hear the water running and then I hear videos of him on the damn phone like he’s sitting on the toilet.

Should I be worried that he’s up to something or in there texting other girls ?