I keep getting played!! What to look for in a guy when they started off incredibly sweet in respectful but started playing games and being rude?

This is the 3rd guy in a row I’ve gotten played by am I dumb for not realizing the red flags and what should I look for next time?

Guy 1 and I were really close for years until he became cold and went I’d of his way to hurt and ignore me

Guy 2: reached out first, was incredibly sweet but had a girlfriends boyfriend lied to me about it before saying he never was interested in me anyway

Guy 3 (current I’m trying to break off with): reached out first, complimented me to no end, planned out dates, tried to impress me, told me about is family life and suddenly pulled back when I liked him back (ignoring me, saying he’s flirting with other girls, barely texting, sly rude comments)

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by the way I’ve never had a boyfriend (these are guys I’ve liked that I’ve been in talking stages with and have flirted with or or shown interest in dating me) I just put this in the dating section because I assume I’ll get the most responses that’s way.
I keep getting played!! What to look for in a guy when they started off incredibly sweet in respectful but started playing games and being rude?
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