I have two experiences:
First one I was 21, she was 19 and I was her second ever boyfriend. She asked me if I wanted to move to Switserland with her and her parents, on basically our the second date. (at home in her bed)
Another relationship; Got told I'd make a great husband and father, really early on in the relationship.
The truth is though, neither of those 'situations' bothered me. There was no craziness involved or anything, and I just saw it as infatuation and romance, and actually kind of liked it.
Both these relationships ended without any weirdness or craziness or arguements.
I almost regret not having better stories, but then I think about my last one. A girl who told me early on, that she didn't feel like sex for a max of 3 days a month. This turned out to be true, but that's more than fine in itself.
What wasn't fine though, was the craziness that ensued when I didn't feel like meeting up. (lets say on a weekday, when I was dead-tired)
What also wasn't okay, was that she didn't tell me she had herpes simplex, before we had sex for the first time. We were safe, and it's basically harmless if she doesn't have an outbreak, but you know; Really not cool.
But to keep a long story short; (and to add context because she wasn't evil or bad, but actually very troubled without realizing) She had been sexually abused by a relative from age 7 to 14, this was found out by her parents after the fact, but that uncle would still came over and this was all just 'okay' somehow. I once asked why nothing was done, she said something down the lines of it being to late. (she was 28)
This girl had been massively victimized, at a very fragile age, and her parents just went; 'Oh well' and left her alone with this massive clusterfuck in her head.
And because she felt dependent on her parents, she buried all that pain and desire for justice, and just filled it up with sex. She had prostituted herself in past, to make rent when she got kicked out by a shitty boyfriend. Later in life she would visit these swingers-clubs, when she was single. (and that's not wrong in any way, but I'm just painting a picture)
Anyways, I had always tried my best to spark some love into her, actually believing it would work. Even went to her parents place, which she kind of tricked me into. But it got to a point, where I wasn't feeling safe to have any sort of physical contact with her, and where I felt very negative psychologically.
I had had my own experience with inappropriate sexual behavior as a kid, with a mom who did nothing to prevent/stop it.
And eventhough I don't live life feeling I'm anything special, I realized the difference between her and me was that I can still feel things... (Self) Love most importantly.
Mind you; I wasn't raped, I'm just making that comparison between her and I, to show she was just worse off... A LOT.
Realizing that the only reason I was fine and doing okay, wasn't because of me fighting, but just because my experience wasn't as extreme as hers, made me wanna kill myself.
For me it was incompatible to be both fine with life, and realize stuff like that is just out there. People that are extremely victimized and lose any idea of justice and lose any desire to find peace, and just become self-destructive instead.
But I just broke up with her. And when she was crying I just couldn't help but genuinely smile. I gave her a good solid hug for as long as she wanted, there was no guilt. I still care about her and I still wish she'd love me back. (Not as a couple I mean, but as people)