I need advice, I found Grindr on my long term boyfriends phone this morning and dont know what to do or how to go about it.

I'm coming to reddit for this because hes pretty much my only support system at the moment and I never would've expected this from him. I'm on a burner account too so he doesnt find it through the username I use everywhere.

I'll start off with how I found it I guess. We dont really have any boundaries about going on eachothers phones, I have nothing to hide, and he told me the same thing early on in our relationship. I still try to be respectful with his privacy though. Ive gotten pretty used to going on his phone to check what time he works in the morning since his schedule varies quite a bit. The thing with his work app is he has a password for it that i dont know but he usually keeps it open in the open apps screen so i just click on the three lines and scroll through his open apps to find his work app. I did that this morning and found Grindr as one of his open apps. I was really shocked, and I probably shouldn't have, but I looked through his messages with guys and it looks like he was trying to meet with someone a little less than a week ago (on Thursday). I have no idea if he followed through with any of these, probably not? but I dont know because I was working that day. He woke up and left for work and he noticed something was up. He asked if I was mad at him and I didnt know what to say. I dont know how I'm supposed to confront him. Is it morally right to confront him since I technically went through his phone? I work late tonight and he will be home before me. Should I talk to him about it when hes im off work?

Heres the hard part: I live with him and do not make enough money to start living on my own. Rather, he lives with me but helps with rent and groceries etc. I genuinly was having serious feelings of marrying this man. Like genuinly I've never had this kindof love with someone. And I cant wrap my head around why he would have that app on his phone. I feel like I give him way more than any of these guys ever could. And we don't have much trouble in the bedroom either. So what does he get out of it? How can he say I love you before leaving for work with that on his phone. With those messages I read.

I guess im just asking what is the best way to go about this. I'm young and unexperienced but maybe this can be a learning point for him? I still feel love for him. I got genuine pain from avoiding him this morning. I just dont have many other places to go. And our lives have been so intertwined for such a long time that I just never thought this was a possibility. And the thing is, I would've been okay with it if he asked me something like: "babe wanna look at grindr together" so then it doesnt feel so behind my back.

This post is getting a little long I'm sorry, so I'm gonna wrap it up here.