I don't know what I am doing

This will be quick because im pretty burnt out but won 8k in the 60/120. Obviously running good but playing good as well. Only had one hand I was pretty upset about how I played.

TT utg limper guy iso in mp. I 3bet they both call. Flop comes 973ss utg limper donks guy calls I raise they both call. Turn is an 8. check. check. I bet. Call. Fold. River is a 9. Check and for some reason I checked behind. In my mind at the time I felt like I wasn’t getting called. I was either going to get c/r or folded to. On paper and afterwards its stupid because he would have donked a nine but i still checked behind and he showed up with A3s with the pair and the flush draw on the flop. Still don’t like it but hes not calling that so I think my action has alittle merit but stil terrible in hindsight.

No degen stories today. But hopefully I will have some later.