Cheating husband ?

Me and my husband haven't been seeing eye to eye for a while he thinks I have attitude but that's cuz he never shows me any affection his always hugging kissing the kids but dismisses me it's always me initiating things with him his always on the phone so yesterday I was speaking to him and he goes I can have another wife and I go excuse me? He goes yeah I can so I go you seeing someone he didn't respond and he goes she can have a higher wage then me a good job I am a stay at home mum even tho he forces me to work I don't need to he gets a good salary plus I have little kids to take care of and I know I wouldn't be able to cope we hardly have sex only when I inititiate it well I went to sleep and I woke up at 2am and he was sleeping with his phone in his hand so I thought that was weird as he has his phone on charge who could he have been talking to? I checked his Instagram.and his following mauritias wedding honeymoon like I don't think deep into things like that but what he said got me thinking deep is he cheating on me what's going on he doesn't even talk to me properly and I can't go into his phone as it's locked don't know that password