I think I've turned into trash what do I do???

So,

From the start of the school year I sat across on a table from this guy (4 times a week every week) and I've known like about him since year 7 (in the same class)

He's been on my radar a while and I was starting to like him till that's was a whole thing with one of my friends cheating on a test and she started to cry because he was gonna snitch and stuff (I thought it was a bit stupid at the time tbh) but I had to stick up for her and he's basically been label a jerk

but I still had tiny feelings for him

Like I'd find myself thinking 'he's a jerk but he's still peng' or 'why can I not hate him like everyone else' and I tried pushing it to the back of my mind but I had to stare a his face for a hour most days and we even started to have convos in public like during lunches so I thought there were some small vibes going on

Until I realise he was dating a girl I'm kid of friends with (she's friends with someone I'm friends with and to be fair he was her boy bestie) and I was a little like 'oh ok I see how it is'

But we still had jokes and I liked to talk with him a lot (even about his girlfriend- in a good way)

Then over the xmas holidays they must've broke up but nobody knew how or why so when I tried to ask him about it my friend made it seem as if I was trying to move to him like right after the breakup and he started being flirty so I (unconsciously) was being flirty and the flirty continued to our class and legit last night we had an 1 hour long convo and I didn't realise ☺️

I think I'm falling HARD but the other day his ex came over to a bunch of us looking like she been crying and glaring at where he was standing and now I feel like trash because I GENUIENLY like him but

-it's too soon after the break up

-everyone's gonna say I'm a ho

-my friends still hate him

-he can be kind of a dick

so...

If anyone has an guidance to this confusing tale then please feel free to comment, thx