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Your betting is way too small. In general (against good opponents), your bet size should be based on the texture of the flop. You're giving the obvious flush draw really great odds, so your raise is pretty bad, IMHO.

I raise to t500 on the flop, maybe t600 even.

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You basically have to ignore that the BB bet only 50 into that flop. Personally, I think it's an excellent bet on his part if he's on the flush draw, as some people with TPTK will forget about the size of the pot and only raise 3-4 times his lead bet, thus giving him the odds.