I don't mind the line you took, but it's dependent on a lot of other factors. I don't mind a fold on the flop either because I've never seen a LAG at 5nl who's not an agro fish who's just waiting to pay you off,
Is his pre-flop bet size standard for him? Or does it indicate strength (i.e. you should be set mining)?
If you were OOP, generally just give up with an underpair, in position I don't mind call downs of as many streets as you think he'll bluff.
When he bets the pot it's a bigger bet size than you really want to call, but you have a pocket pair and position so I don't mind it. Same as pre-flop though, is this sizing normal for him or should it be setting off alarm bells? Also does he cbet a lot, or does he give up when he misses completely (at 5nl, assuming people are cbetting air and hands that hit is a big mistake).
Turn, okay, he bet really big pre-flop at 5.5bb, he then bet full pot on the flop and he has now bet 2/3 pot on the turn, this stands out enough that it usually means "I give up" or "I was bluffing
and now I just made my hand, please don't fold!" unfortunately it sometimes does just mean "I'm a spazzy fish and I'm mashing buttons", the pot size is going to get out of control if we call so I don't want to look him up, but I'm definately keeping an eye on him if he takes this line against someone else to figure out what it means.
Whatever he has, if you call the turn you can only do so with the plan of calling on the river, and bluff catching for stacks is almost always -EV.