I’ll tell this story, although it doesn’t reflect well on me. Just remember that I was young and emotionally immature. Sorry it’s so long.
I met a very handsome man, same age as me, mid-20’s. I am very ordinary looking so I was very flattered that he paid attention to me. I thought I was in love, for the first time in my life, and I told him so, but I think I managed to do it in a non-pushy, non-threatening way. I continued to feel these very strong feelings for several weeks, until the night he told me that he loved me.
Whumpf! The strong feelings evaporated. I immediately realized that I was in love with the chase, and (like a dog chasing a car) now that I had caught the object, I didn’t quite know what to do with it.
We spent the next four years in a relationship, off-and-on but mostly on. One time when we broke up I begged him to come back, and he did. We never lived together, because he lived with his parents and he wouldn’t be able to explain it to them (he was in the closet with just about everyone but me). Gradually, though, I got fed up, and I finally signed up for a year-long overseas study program, partly to get away from him. But during the entire year we wrote ardent letters back and forth and I missed him a lot (I was rather lonely in a foreign country). When I came back, we moved in together in another city, which lasted all of 6 months. We had the talk, at my instigation, after a while I moved out and ended up pretty quickly with another relationship. In the meantime, we stayed in contact, we even had sex of a sort a couple of times.
Several years after our breakup, we had a phone conversation where he said that he decided he wasn’t gay and that he was going to pursue heterosexual relationships. I said “what about our 4-1/2 years together?” He said that during this period he was just exploring and it didn’t mean anything. I felt strange but mostly sorry for his self-delusion. Not long after he called again and left a message on my machine, but before he left the message he spent some time and energy to make fun of my outgoing message. I felt a deep anger at this, which I didn’t immediately understand, so I thought about it for a while. I then realized that he had been making fun of me in various very personal ways, especially making fun of my appearance, during the entire relationship, and I had taken it because I had low self esteem and had felt lucky to be with him. Did I mention that he was good-looking (and knew it)?
I didn’t return the call, he never called back, and I have never talked to him since.
My self-esteem is much better these days, and I don’t put up with ill-natured sniping from anyone. I’m in a very satisfying LTR for going on 20 years. In between that first relationship and this last one, there were three or four others, but the first one is the only one I dislike. To answer the OP, it happened almost overnight, or it happened over the course of many years except that I didn’t know it.
Roddy