Masturbating normal??!

Hoping to get a man’s opinion or even other women, I guess. My husband and I have been together for 7 years, married for 1. I found out back in September that he’s been masturbating. He hid his toy from me and has had it since November of the year prior (almost 1 year) I also found out he’s been exploring anal play with himself.. now I know I may not always be in the mood but we do have sex a few times a month. We live together and he says that masturbating is normal in relationships and that it’s just because he feels like he needs to bust a nut.. the issue is he only does this on days that I work and am not home. In a sense it makes me feel like I am being cheated on.. because he doesn’t vocalize his needs or desires from me. I thought that maybe if he shared clips of him masturbating that it’ll make me feel better about it and he agreed and then out of a sudden he says it makes him feel like crap and makes him want to cry and makes him feel violated.. so he stopped doing that and yet he is still masturbating behind my back and when I ask him if he did he gets extremely confrontational and upset with me.. what do I do.. is this normal?