What's the difference between honeymoon phase and people pretending to be someone they are not for sex?

Anonymous
I have a few friend who said they dated men who ended up turning super toxic after a year of dating or turn into a completely different person then who they fall in love with. Is this the same as the honeymoon phase or what? I have a ex guy friend who would pretend to be a nice guy to sleep with women.

I know honeymoon phase people tend to still be “lovey-dovey” with each other and are still trying to “impress” each other.

As time goes by, we tend to start letting the “real” us out. The things we kept hidden, like the flab we carry, the wrinkles under a woman’s makeup, the real size of her clothing. Burping and farting and all the little annoying habits we have kept hidden start showing.

a lot of all issues start showing are up people stop trying to impress their partner and shows the real selfs. Do you think people really pretend to be someone they are not to impress someone then stop after time go's by? I never experince this myself
What's the difference between honeymoon phase and people pretending to be someone they are not for sex?
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