I (28f) commented on a post of my boyfriend (29m) on a "are we dating the same guy" page and he found out. What are my next steps?

I (28f) recently found a post of my boyfriend (29m) on a local "are we dating the same guy?" page. We have been together for five years. There were several comments on there of girls stating they texted him/went out with him and I couldn't tell if this had happened recently or if it could have been from a long time ago.

So I commented on it anonymously asking if anyone has talked or hooked up with him recently and a girl responded saying she did and asked if I did as well and if I had any "tea" on him. I probably should have said I was his girlfriend, but I was so embarrassed I couldn't, and worried I wouldn't get any information so I just said he told me not to talk or sleep with anyone else and he wouldn't either but that we never hooked up. She responded back claiming he said the exact same thing to her. I then asked when they last hooked up and she never responded back.

My boyfriend then comes home and is furious, slamming doors, giving me dirty looks, but won't say anything to me. I know he knows I was the one who anonymously posted because I had suspicions that he had been cheating on me and have recently been asking him, and he denied doing so.

I then go back to the post and all of her responses are deleted so I know she told him, and I'm sure he told her to delete them, but he's pissed at me for it.

Anyway, what are my next steps? Do I confront him about it or just wait and see if he says anything?

Also, we rent an apartment together and are on the same lease so that makes things even more complicated.