Friendzoned a guy, and now he’s been unnecessarily rude, why?

Both of us are in our mid 20s. I met this guy on a dating app but we clashed heads a lot on a ton of things. And he was the one that said things just wouldn’t work out.

He moves on to some other girl and she wasn’t interested in him so he tried running back to me. I said no. Obviously. Even tho he insisted. Why would I want him after all that? I said we could be friends (not really meaning it, I just wanted to keep the peace since we found out we had mutual friends; didn’t want to leave on bad terms with anyone, ya know?)

So last night. I went out with friends and got pretty tipsy and I couldn’t find my house key. So I tried texting my roommate that I was outside. So she could let me in. Except, i accidentally texting him “I’m outside”. I apologized right away. And his response was “I could care less bro”. I responded with “I was just apologizing. Goodnight”

but why the unnecessary rudeness from him? He went from begging to now being rude and for what?

Friendzoned a guy, and now he’s been unnecessarily rude, why?
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