best case: (Not jacks and no heart for backdoor flush draw)
http://twodimes.net/h/?z=1202296
pokenum -h jh th - ac as -- 4h ts 2h
Holdem Hi: 990 enumerated boards containing Ts 4h 2h
cards win %win lose %lose tie %tie EV
Jh Th 493 49.80 497 50.20 0 0.00 0.498
As Ac 497 50.20 493 49.80 0 0.00 0.502
Jacks would be worse but not that bad
http://twodimes.net/h/?z=1202298
pokenum -h jh th - jc js -- 4h ts 2h
Holdem Hi: 990 enumerated boards containing Ts 4h 2h
cards win %win lose %lose tie %tie EV
Jh Th 427 43.13 563 56.87 0 0.00 0.431
Js Jc 563 56.87 427 43.13 0 0.00 0.569
Nothing wrong with the move as he could likely have folded...I take it from your tone that you lost but it's a pretty standard move.