With only us vulnerable, I dealt and passed, as did my left hand opponent. Partner opened 1 diamond, right hand opponent overcalled one spade, and I passed a second time with the following: ♠ QT42 ♡ JT732 ♢T3 ♣ Q8. Left hand opponent raised to two spades, partner passed, as did right hand opponent. This placed me in the "cut off" seat and I passed.
Partner had 20 high card points, and asked me why I didn't "balance" with my five hearts. I said that he should have doubled with his strong hand. WE got a bottom because everyone else with our cards made four or five hearts.
Partner had opened, but in third position, so he might be "light." Diamonds was his longest suit but it was not genuinely long since did not rebid it. I figured out after the hand that partner had to be short in spades (he had a singleton, but it was the ace), since both opponents and I obviously had length. I could therefore figure partner for three or four hearts (he had four), but I didn't know if he had any high cards in the suit; all his values might be in the minor suits.
Was it therefore incumbent on me to bid three hearts with my five hearts but otherwise weak hand? Or should I wait for an actual double before doing so, especially since we were vulnerable versus not?