What would you do?

I had just started playing heads up when I got into an interesting spot. The guy three bet me on the 3rd hand, so I had a decision to make with my As 5c. I could fold my marginal hand and get on to the next one. My reason for not doing this was because my hand happened to contain an ace. I felt folding an ace here is marginal since I probably have the only ace in the hand, and therefore have the lead if he doesn't have a pair. I could also 4 bet him and see if his 3bet range is wide. Reasons for doing this is to show him I won't be pushed around, and that I am an aggressive maniac, which could be useful later in the match. The reason for not doing this is we are pretty much forced to call his 5 bet since we have a lot invested. My last option was to call. I had many reasons for calling preflop,
1. I gain information on his 3bet range if we get to a showdown.
2. I get to see how likely he is to continuation bet in a 3 bet pot.
3. I show him that I will not be pushed around.
4. etc..

So I call the raise and we see the flop of 5s 4h 10c. I feel like this is a pretty good flop for me. His three bet range is pretty wide, but I feel like if he is doing it with a hands like AJ AQ AK KQ KJ QJ plus all pairs, we are fairing well. So he bets out $5 and I decide to make the call. His bet of 5 seemed weak to me, but it was only the 3rd hand so I didn't make much of it. The turn was the 2s. I was a bit surprised when he bet out $16.5 into the pot of $19. To me it didn't seem like a value bet, and had me feeling like he just wanted me out of the hand. I could have read this wrong, but that was my gut feeling. The river was the 6c, and he led out all in for $23.25. This is where you the reader come in. What do you think I should do in this spot? This exercise is both for you and for me. What do you put our villain on? Should I have folded preflop? Raise the flop? Fold flop, turn, or river? Here's what happened up until my decision

Absolute Poker $50.00 No Limit Hold'em - 2 players - View hand 721432

The Official DeucesCracked.com Hand History Converter



HEYLETSPARTY (BB): $49.25

Hero (BTN/SB): $50.75



Pre Flop: ($0.75) Hero is BTN/SB with 5 A

Hero raises to $1.50, HEYLETSPARTY raises to $4.50, Hero calls $3



Flop: ($9.00) 5 4 T (2 players)

HEYLETSPARTY bets $5.00, Hero calls $5



Turn: ($19.00) 2 (2 players)

HEYLETSPARTY bets $16.50, Hero calls $16.50



River: ($52.00) 6 (2 players)

HEYLETSPARTY bets $23.25, Hero?