Preflop plays(3-bets, 4-bets)

[gsdavid]

I have general question on 4betting villians, when i used to play on 100s a 3bet preflop meanth QQ+ 95% of time (when they 3betted me), but now on 200s some of the villians are doing it much more liberaly..so basically here is a hand i had today:
a relatively tight opponent in MP, 23/14/4.5 over 200 hands reraised my AKo in UTG from 8$ to 28$...whole table folded and i decided to 4bet him to 68$... he had 230 and i have him covered(actually stacked him few orbits before when he flat called my 77 raise with AA and i hit quads on river)
So the question is how do you play back? do you just flat call his 3bet when OOP..do u reraise and fold to push(like i did but i feel i just wasted 60$ for nothing)...im not so used to 4 betting with weaker hands(AK AQs and sometimes SC or QQ)
what is standard approach to when u 4bet and villian pushes?
tnx

[black_knight6]