sigh and fold
people underbluff and peole really underbluff otr and people really really underbluff when they bet big and people just dont bluff into ranges that contain the nuts. You should have some Tx in your range. If he is bluffing, you will pick it off eventually, take a note and own him. If you notice a lot of people doing it, adjust basic population assumption.

It sucks but yeah we have to fold here.

Call.
He doesnt have that many Tx w this line but he seems pretty aggro and could be bluffing flush draws like this.You also block JT but dont block any fd combos and youre close to top of your range. If you start folding everything except Tx here (which u dont have too many), you`re gonna be way overfolding.

Agree with SPrince about the fact we will totally overfolding this spot if we start to fold this hand.
BUT, who care at this stack ? This spot will not come so often and even if... how many V will really exploit you here ?
SO, i think Limp Limpson is right, that a pretty easy fold. Vilain will reaaaaaally underbluffing this spot.

Sorry for my english. I'm french and my english is not so good.

I would chback flop.
As played I would fold until i have any notes about his game. I think at nl20 people probably tend to not donkbet bluff with pairs in these situations, and it's pretty hard for him to have air at this point.