[chok1]

You said you knew that he had top pair. If he was abc with his raises, not LAGgy, would he raise kj, kq , ak before the flop? If he does raise with them, you can almost instantly put him on k10. I think your read should've been to make him pay to catch you and overbet the pot trying to get him either all in or fold. You say slowplaying was best decision, well if it was you got caught. Tough to fold underfull. Only thing I can say is you MIGHT have been able to get away from it with the pot being unraised, but those situations are moment to moment. Tough to answer have to know opponent.