AIO Boyfriend of 4 years cheating

I looked through my boyfriend (28M) of 4 years phone today because he threatened to fuck someone else this weekend when angry at me. Found he has tinder the app downloaded but no account and he snap chatted a girl “how you going m8” a week ago who in 2019 had sent him a video of her shaking her ass. Obviously because Snapchat doesn’t keep any conversations I couldn’t see anything other than what he had saved in the chat. Some further context a year into our relationship I found out he had a tinder account as well and messaged a different girl on Snapchat saying “10/10” to a photo of her with her boobs out. Yes I stayed but now I’ve told him he needs to pack his stuff and get out of my house.