I think I sold a lot of BTC to a fraudster/ scammer on bisq

So in the last few days I was arbitraging with one specific person in 0.01 BTC pieces each. (Sold 5% higher and bought back cheaper) (I received basically thousands of euros)

After a few trades he says he pays with another bank account and I said yeah okay. And every single bank account that person used was a female name. Also, he said lets do some trades off-bisq and I also did that because the mempool was crazy congested.

How much time can be over so a chargeback is non reversible by the bank so I don‘t loose my hard earned btc and my fiat? And how can I protect myself from that?

I can‘t sleep right now because I think I cam loose everything and get trouble with the police. Any suggestions?

UPDATE: Thanks for all the help, SEPA was used I have no money on the bank. It was always almost instantly bought back into bitcoin. I still am afraid of getting prosecuted for allegedly being abfraudster or cyber criminal tho I am not. (And never was) I will just stop now.

What do you think will happen? We are from the same country in Europe

UPDATE 2.0: I just learned, that people can retrieve a transaction between a 8 week window (when there is a suspicion on fraud even 13 months)

So I think if it is a real fake identity, I will most likely lose all my fiat and I have to repay my fiat debt, with bitcoin, wich will be more that half a btc most likely. I really hope that is not the case but I think so. Fuck scammers man.