Tldr : a friend I haven't seen in 3 years bailed early on our pre-planned hangout time to go be with a new fling, and now they're ignoring me. What should i do? (AKA I think my friend abandoned because they got a new fuck buddy, am i crazy?)

background:

Friend and i have known each other around 4 years, haven't seen each other in 3, he lives 5 hours away and for most of that time I didn't have a car. I was going to host a socially distanced movie screening in my large backyard. We're both in healthcare and regularly get tested, no fear of covid. He was going to drive down saturday, the day of the event, stay the night, and leave the next morning.

About 6 weeks ago, he and his long-term partner broke up in an ugly way. I reached out to him, and we began talking almost every day. We got closer through this. I also began to talk about my own personal hardships, we bonded. We were talking frequently. Occasionally we'd flirt, but it was in a v joking way, i'm a lesbian. I had been down recently, and without prompting he took off work so that he could come friday night, help out saturday, and hangout sunday morning, then leave sunday afternoon. We talk p much every day, he's posting best friends memes on facbook and tagging me, etc. A week or so before the event we started talking less, I didn't think anything of it, I was overwhelmed with school. I found out later that he at this time had started sleeping with a new-ish friend.

The day comes, and he's 4 hours late in arrival. It stings, but I don't say anything, its no big deal. He was busy and then he hit traffic because he left late. That night we're like, gossiping like we're at a sleepover, and I ask him about a friend who had said something on his facebook - he confirmed, they'd starting sleeping together. I congratulated him on the new fling.

 Saturday morning we're getting ready to go get lunch or whatever, and i ask him what time he's leaving tomorrow afternoon, and he says "early, or maybe even tonight, Pal needs help moving" and i was just shocked, I responded "were you not gonna tell me?" and went to put my shoes on. Not the best reaction but I was taken aback.The rest of the day continues with tension. I'm trying not to act really hurt. I try to make light of the situation by ribbing him for being mean, but making it super dramatic so he knows it's a joke. I say things like im being orphaned, etc. For perspective, we have a very trolling friendship. A main bit of ours is that I'm not actually his friend, I'm a robot tryint to steal his identity and his bones to take his place in society. At one point, to try to make things better, I tell him up front that he hurt my feelings, and he responds "im sorry" I try to explain myself, but my roommate walks in the room, and I drop it. At one point I can tell I've crossed a line w a joke, and I give him some space. I go to run an errand, he doesn't want to come so I leave him at my house to play video games.

After the movie and everyone leaves, I approach him and say that I'm sorry, I wasn't hiding my feelings well, and I could tell I crossed a line. He says that I did make him uncomfortable, but he understands, he has no hard feelings. I wait for him to apologize for bailing on me last minute, but he changes the subject. We chat for a bit, and  I tell him that I want him to go tonight, it's okay, I understand. He thanks me and leaves. He texts me that he made it back safe, I tell him to tell Pal that I hope their move goes smoothly. He leaves me on read. I text him a meme with a mutual inside joke 2 days later. Ignores it. I text him a question mark later to be like, what gives? He doesn't open my message. Two days go by, and today I ask him to be up front with me, if he doesn't plan on speaking can he let me know so I can move on.

And that's where we are now. I have an inkling that maybe he thought the flirting was real, and was upset when it didn't lead to anything, and then prioritized his new FWB. this makes me feel super shitty. I don't know if i should address it, or wait for him to, or just let the relationship die.