3bet preflop, raise flop

Can you explain why this is better, the blind info isn't much help on it's own.

I didn't 3 bet to use my position and and because he's either going to fold to a 3 bet when behind or 4 bet me as he's good enough to not want to play oop in a 3 bet pot ever b vs b. So I am essentially bluffing if I 3 bet rightin this spot right? If my hand was strong enough to felt pre flop I'd defo raise.

Again I didn't raise flop because I'd get shoved on by fds and better aces and didn't see a prurpose in it with a somewhat marginal hand.