Found my boyfriend on tinder UPDATE

So my bf and I have been dating for about a year and a half and have been living together for over a year. We met on tinder over 2 years ago, started off as fwb and then caught feelings. Well we were laying in bed cuddling while he played his PS4 and he picks up his phone. The way I’m kind of spooning him his phone is basically in front of my face so out of reflex I glanced down. He has an iPhone and he did that thing where you swipe over and it pulls up Siri app suggestions and I thought I saw tinder....well next time he pulls his phone out I watched for it and sure enough there it was. I immediately become fucking livid but I’m trying to keep my composure and pretend like I didn’t see anything while I figure out the best way I want to handle this. That’s where y’all come in, I need help figuring out what to do!! The options I’ve thought of so far:

1. Wait for him to go to sleep then open his phone and have a look at his activity on tinder

2. Confront him in person and ask why he has it- the only reason I’m hesitant to do this is cuz I dont want him to say well you shouldn’t have been looking at my phone

3. Get on tinder myself and match with him

4. Be extra petty and say some shit off hand like “since you have tinder do you think I should download it too?” Or “hey how’s your tinder matches going?”

If y’all have any other suggestions let me know. Thanks!!

UPDATE

YALL IT IS WORSE THAN I THOUGHT

I finally got a chance to look through his phone. To my surprise not tinder or any dating apps. But then I checked snap chat and thank god those convos were saved. There are THREE GIRLS

So yeah. Literally found this like a few hours ago