Aa

Calling the Flop in Position in order to raise the Turn again is ok but capping the Flop is fine too but BB might have a mediocre Ax type of hand (though you already block 3 Ax Combinations) that he's going to bet again with on the Turn so just calling the flop an using your position is fine but on the Turn you overestimated your hand a little bit. Lets take a lookg upon MP1's Line. He donks out the Flop and just calls BB's 3bet. When the third appearead on the Turn he's raising again.

Flushdraws are likely to be donked out on the Flop and since nobody else can really have a strong hand since JJ would have given more action preflop - you are facing a madeflush on the Turn too often that just coldcalling would have been the way to go. If Preflop would have been more action and you'd have Set JJ, it's likely that both could have a strong Ax or a lower set but consider that BB has shown some strenght by 3betting and betting the turn. It increases the chance for Mp1 to have a madeflush even more.

In absolute hand strenght it might be an easy 3bet but considered relative hand strenght it's just a coldcall and call on the River and as played - Call River.