A story where we (24M, 25F, 22M, 42F) all screwed up

So I’ve had quite a few crappy relationships. I mean, relationship wise they had been really good until a certain point where things went straight downhill. So this is a story about one of my exes, and the way it crashed, like those airplanes caught in sudden storm.
We started of quite crappy tbh, we lacked chemistry and weren’t much compatible in bed at first, but we really liked each other and that had helped us push through all of the negative aspects. We didn’t move in together, I used to visit her place where she lived with her younger brother and a friend of hers. The roommates were quite welcoming but at the same time weirded out by me, specially her brother, but I couldn’t tell the reason since I didn’t act or do anything out of the ordinary. I asked my ex and she said it was nothing so I let it go.