This just happened to me last night. I was on the button and the only caller of my preflop raise was BB. I had AKh and 2 hearts pop out on a rag board. He instantly went all in, and I called and won.

You have 15 outs here. You're better than even money to improve with two cards to come. I might fold if my stack is huge and covered. In this case I had slightly less than the table buy in, and had him slightly covered as well. Also, he was a very aggressive player so I felt like all my outs were good to improve over him.

My answer is you should play it according to your opponent. If he's tight, I don't call huge bets. Otherwise, I hang in there as well as I can.