horrible fastplay?

[SNOWBALL138]

My thought process here is that I might get called by a pocket pair or a bad jack, but that if a diamond comes off, my chances of getting paid are slim. Also, if he is semi bluffing, I am the one who might end up paying him off. Is this a horrible play?

***** Hand History for Game 1965714879 *****
NL Hold'em $10 Buy-in + $1 Entry Fee Trny:11713898 Level:2 Blinds(15/30) - Thursday, April 28, 05:57:49 EDT 2005
Table Table 35027 (Real Money)
Seat 7 is the button
Total number of players : 9
Seat 1: RedBloch ( $865 )
Seat 2: Makke222 ( $830 )
Seat 4: BigLexMuFuka ( $715 )
Seat 5: heheapov ( $745 )
Seat 6: bposner ( $1290 )
Seat 7: oharabus ( $880 )
Seat 8: marchcalls ( $960 )
Seat 9: kolobok1 ( $960 )
Seat 10: NoLmtSolja ( $755 )
Trny:11713898 Level:2
Blinds(15/30)
** Dealing down cards **
Dealt to RedBloch [ Jc Ks ]
NoLmtSolja folds.
RedBloch calls [30].
Makke222 folds.
BigLexMuFuka folds.
heheapov folds.
bposner folds.
oharabus folds.
marchcalls calls [15].
NEW: OMAHA $3,500 Guaranteed Tournament - Today at 12:00 PM- You have 5 hour(s) 56 minute(s) to register!
kolobok1 checks.
** Dealing Flop ** [ 5d, Js, Jd ]
marchcalls checks.
kolobok1 bets [80].
RedBloch is all-In [835]
marchcalls folds.
>You have options at Table 35052 Table!.
>You have options at Table 35260 Table!.
kolobok1 folds.
RedBloch does not show cards.
RedBloch wins 1005 chips