Help me find this

It’s a Japanese bl that I think was relatively short. I read it years ago and I believe it was like one or two chapters featured at the end of a different manga(like a different story but same artist?) I think the uke and seme were in college and they were dating. But the uke is gay and is the only one who has feelings. For some reason the seme agrees go date the uke but he’s straight. He continously gets with girls while being with the uke and completely disregards ukes feelings. The uke just seems to let it happen. I think the turning point was the seme going on some trip or retreat with friends/classmates and there was a girl involved. The uke doesn’t really react and lets the seme go and the seme gets really frustrated about the whole thing and ends up going back to the uke and confronting him. They do end up together but I can’t remember the name of this. Like I said I think it might have been some kind of side story of a manga that was included in the extras or something, like when the main story ends they add in like a chapter or two of another sotry? It wasn’t a recent release as I’ve been trying to remember this for a good few years.