[ricdaman]

You need to bet the turn to see where you are at.

Once you bet, if they simply cold-call, then you are probably still ahead. If MP1 raises, then I would fold. He probably has you beat. If MP2 raises, then I might call depending upon what hand you put him on. His raise pre-flop suggests a PP smaller than yours or two overcards. The only thing he might have is two suited (spades) overcards, where the turn gave him the flush, so again, it depends upon your knoweldge of MP2 as to what he might raise with.

The worst thing to do here is check. The last thing you want to do is give your opponents a chance a free miracle card.