Should I stay?

Throw away account and new to Reddit so please be kind and apologies if anything isn’t accepted.

I (mid twenties female) married by husband (mid twenties male) in September 2025. We’ve been together 4 years and haven’t really ever had an argument. We work well together, I’m the outgoing one, he is introverted, I’m a bit of a drama queen and he’s more level headed and logical, we have the same hobbies ect. You get the picture, my friends and family adore him.

Tonight I discovered he not only is part of a large BDSM discord group and is an avid contributor, but he also has various other accounts on other sites acknowledging his various interests (far beyond anything he has shared with me). I also discovered an emotional affair with a girl in Australia which has been going on for a couple of months (pics / video / audio shared but also deeper convos and a connection). The girl has connected with me on social media after I found the account and she has gone into detail about their communication.

I confronted him about it and he fessed up immediately, couldn’t shed a tear but was saying how he didn’t want to lose me and he was living a lie. He has offered to delete everything and start again. Should note, 2 years ago he told me he had an addiction to porn and told me he’d stopped looking at it and gave me a memory stick which supposedly contained his stash - obviously didn’t.

Feel emotionally drained, we had discussed trying for a baby in a couple of years. Nervous to have to start again finding a new partner. Love him but don’t trust him.

So the question stands, should I stay? What would you do?