I guess it depends on whether she's marriage material. In general I'd say yea after 5 months thats too soon. But that doesn't mean she's crazy, just means she's looking to get married.
Doesn't this fit your whole thing, a girl in her early 20's looking to get married rather than riding the carousel for 10 years? Then when you find it, you immediately dump her?
Not trying to be antagonistic, just trying to understand your choices within your worldview.
She was 26, so not exactly "early 20s" she had also been previously married. And no, I didn't "immediately dump her". She gave me an ultimatum, "marry me or I will leave you for someone that will, and I actually have someone in mind". I said "ok, bye". 2 days later she called me to tell me she lied and she didn't have anyone else, I told her that I was busy on a date with someone else (true story).
I suspect that she "needed space" and just got pumped and dumped by the guy that she thought would commit, or she had sex with him and realized it wasn't as good as sex with me. Either way, I wasn't taking her back.
Some things she would decent marriage material for, other things not. She was used to being treated like a sugar baby spoiled princess by her previous husband (he died not even 13 months ago) at the age of 52, of a heart attack. There were some definite red flags (IE: she told me about 4 men in her past, but I suspect it was definitely closer to 10+). Ultimately the bigger problem is she didn't really complement me or enrich my life, she was just a hot piece of ass that I enjoyed fucking but didn't otherwise improve my life. And I didn't trust her, she didn't tell me that she was a widow until after we'd been dating for 2 months and I directly asked her about it (I figured it out on the 2nd date). She didn't tell me when she was moving to a new house until after she had already moved and she asked for help with her stuff. Little things that I'm used to from dating other women and enjoy... just never happened.. She could go multiple days without texting me, sometimes I'd be the one to break the radio silence after 3 days. So yes, having sex 12 times in a week of crazy hot amazing mind-blowing sex was cool... Hearing that she only slept with her husband twice a month (her words, so probably close to once a month)... not so good. Yes, I realize old beta bucks husband wasn't arousing to her... but Somewhere there is a happy medium. She didn't do a very good job of even pretending to be romantic, she was always about "what use are you to me"... and in her world view, I was only useful to her if I was willing to pump her full of babies and take care of her financially.
Meanwhile, even just 3 dates in, the level of trust I have for the new girl is already above what I had for the chinese girl. IE: She claims I'm the 3rd person she's had sex with, and that she's also given 2 other guys blowjobs... and sure enough, my bullshit meter didn't even blip up a notch (3 random hookup, 1 four-year boyfriend seems pretty much as good as you can get for a 20 y/o, if she wasn't at the point where I'd say 50% of guys would probably just turn her down based on appearance)... And she's much more "feminine" she texts me in the morning to ask how I slept and when I'm at work she'll ask how my day is going... It's little shit like that, that I missed while dating the chinese girl
edit: so, yes, I thought the chinese girl might have fit the bill initially, which is why I kept her around as long as I did and put up with a lot of her bullshit, but I'll let her be someone else's project now. I don't need to tie myself financially to a 26 year old working for close to minimum wage looking to become a SAHM without having decent home keeping skills while she slowly builds up more and more student loan debt.