Need advice about possible cheating ASAP!

Just typed this all out on my phone and accidentally refreshed the page fml so here we go again 😡Not sure if this is the right section I've never used reddit before but am desperate to get some perspective on this!I'm a gay male in his early 20s who lives with a close friend who is also gay similar age. He has a boyfriend who is one of the nicest guys I've ever met, they've been together for almost a year now. I've always been a little jealous of their relationship - not like them personally but I want something like that but have never been on a date. Anyways:Let's call my friend/room mate Harry and his boyfriend can be Jake. A few weeks ago Harry came up on my tinder so I sent him a screenshot asking why that was, he kind of shrugged it off and said his first convo with Jake was on there (they met thru tinder) but he got a new phone not too long ago so I mentioned that and he kinda shrugged it off and said he wasn't like swiping or whatever so I was willing to let it go.Then a few days ago when I was in the room with him, he posted a screenshot of something in his friends wall, and in the top left corner where on iPhones it says the app u were previously in, it said tinder - so I zoomed in and said something like "not you exposing tinder!" Kind of jokingly and he sort of shrugged it off and I changed the subject cos it felt awkward, and I checked soon after to see he deleted the post.This has all been in my mind a lot, so I did what probably isn't the best idea - made a fake tinder. I swiped no on everyone but Harry when he came up (this was last night) and today it was a match. I messaged him and he responded - just a typical "hey how are you" level chat so far. Now I'm freaking out a bit and don't know what to do next cos he said he wasn't taking to pepole, but also to be like blatantly using tinder would be a stupid idea if he were cheating on jake?My next options are: 1. To delete the app and let it go - not my business and I shouldn't be prying. 2. Keep chatting - ask what he's looking for to see what he says, which in pranoid about.For him he could either be: A. Bored and aimlessly chatting to guys/seeing how many matches he can get for an ego boost? B. Be looking for friends like some people do on there. C. Cheating on Jake. D. In an open relationship with Jake - Harry had spoken about how some of his friends who he no longer speaks to were in open relationships yet he claims to not be about that life at all, he openly admits to sleeping around a lot when he was single, but it wouldn't be a huge surprise if he were into that - but I'd be shocked if Jake was into that. But anyway if they were that still would be bad as he always denied that stuff and idk I'm not really comfortable with the idea.If it's one of the negative options I'm scared as it will most likely end our friendship if I expose in or at least make it weird living together as we're both signed to our lease for 6 more months. But it I don't say anything if I found out something negative it will just eat away at me.I hope that wasn't too hard to follow, any advice would be greatly appreciated!!