I Don't Know What To Do

This guy and I are not in a relationship, but we have been hanging out one on one, texting and talking a lot and about things that go beyond friendship. I really like him, and he has stated multiple times how he feels about me which is the same way I feel about him.

So today, I was on the Instagram of an acquaintance of mine, who is a good friend of his. Anyway, I'm looking through her feed, commenting and liking away when my heart stops. The friend posted multiple pictures of him and another girl holding hands and sleeping on each other with the captions "This needs to happen!" "So cute!" "I want them to date!" He liked all of them but didn't comment anything.

I'm really unsure how to proceed from here. The most recent one being from yesterday and the oldest from 5 weeks ago and we've been hanging out for probably 6 months.

Do I bring up that I've seen the photos? If so, how?

I'm not his girlfriend so I can't get too upset, but when a guy says he likes you and says things that go beyond just friendship, you assume there's something there, right? I did anyway.

Should I text him and talk that way or meet up in person this week?

I'm really upset and nees advice.