I am kinda agog at posters downplaying how awful it is to throw a drink over somebody. Have you ever had it happen to you? I have and it's awful. I wouldn't for a second claim it was the same as being punched or slapped, but it's extremely upsetting nontheless. It's a shock, it makes you lose your breath, its degrading and humiliating. One of the worst bits is that you're now soaking wet, so the evidence of what they did is with you until you can go change and dry off. It ruins your hair and makeup you've put such care and effort into, if you wear contact lenses and it goes in your face it can hurt like hell, and then you have a mess to clean up (which the thrower rarely does, I imagine).
If my OH ever threw a drink over or at me because he didn't like something he'd seen on my phone, rather than talking to me, I would be seriously considering leaving him. It's an act of complete disrespect.
OP over reached massively. I'm trying to picture them both stood there, her seeing some porn on his phone (long enough to see all five of the videos and pictures) and then throwing water over him, shoving him, and kicking him out of the house for a prolonged period of time (long enough to be on here asking what she should do because she 'hasn't decided whether to let him back in yet'. And what I'm seeing, if those things are all true, is abuse.
And I'd be surprised if there haven't been other similar incidents. If she thinks it's okay to do this to him because she doesn't like something she's seen on his phone, how does she react at other times when he displeases her?
OP was abusive, trying to downplay this because 'it's just water' is absolutely disgusting.
Let's imagine for a second OP's husband saw some porn on her phone. He threw his drink over her, shoved her and kicked her out of the house. And couldn't decide whether to let her back in or not. Would the apologists here all be saying it's not that big a deal and those calling it abuse are overreacting?