The last bet u can't in my opinion. i think u can consider just call behind OTF, but both ways are ok for me. Cbehind is good because I don't think he is folding pair to your raise and you can see a Card to improve your hand if you're not winning already.

Just calling with this hand would be normal, you have two strong overs, ace-high, and a bdfd.

I don't think it's a easy fold if he donks. I think I'd call his flop bet with overs and backdoor flushdraws, so basically cards with outs. I'd probably raise his donk bet if I had no outs and give up if he calls or raises. After he reraise's you it's a easy fold IMO

I would just call the flopbet.