[Suddenly got cash back to my real bank?]

Hello!

I had a REALLY bad session with some high bets at this casino site some days ago.  
I got really frustrated because i won on 3 out of 50 spins on low volatile games, and i guess 7/100 spins hit with under 1x win. 

I contaced live support in rage, said things as it is - and closed the acc forever. 

Now this other day, i saw that the balance was back in my real bank account - which i didnt even ask for? 
To be honest, it was a stupid decision for me to gamble that, and this may be my chance to "save myself". 

I havent got any email, or message from bank or the casino site.  Its been 6 days now.
I am afraid they will suddenly call me and say that i owe them 10x the other amount, but I dont think they have the right to do that?

What would you guys do? THank you for honest answers