Why would a man go from being obsessed with a girl to not caring about her & using her?

Anonymous
Beforehand he would text me all day and everyday and talk about me all the time he was extremely protective and possessive
things he would say before;
”I like you a lot” “I really like and respect you I want you” “you’re mine baby girl I would hate to see you walk away”
things he says now: “why would I want to keep dating you? Stupid game player.” “You ruin everything” “if you ain’t giving me what I want then leave me.” *showing his friends my nude*
he used to literally fully beg me to stay before... he never let anyone say a bad word to me And now he basically tells me to walk away after any minor inconvenience then im the one having to beg him and try to keep him.
its weird! Part of me is obsessed with the concept of staying with him just to see if I can get him obsessed again... he does do the things he did in the beginning here and there but I’m pretty sure he does that so he can use me
Why would a man go from being obsessed with a girl to not caring about her & using her?
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