[furfur]

An excellent player likely isn't calling w/ 4,5 suited despite having position. He may have a,k and that would stand up to the way he played the hand thus far. Basically, ur in a tough spot b/c ur out of position. I like the line proposed by other posters, bet-fold to reraise as ur line would represent ak or aa very well and a reraise would allow u to get away from the hand more easily than the way the hand played out in which you basically invited him to bet the turn. Despite the invitation, as played u probably have to fold. Additionally, why not just limp w/ JJ preflop when out of position and so deep-stacked?