Too many imponderable and variables, I think, but if Jack had found instead of Lureen a women whose character matched his in some ways and who wasn't particularly interested in hetero sex, maybe, but more probably if she'd been tolerable, even maybe acceptable, as a friend and companion and he hadn't met the one man. Other than Ennis he never did - maybe he didn't look all that hard because it was too dangerous. If we're assuming that neither Lureen nor any other woman he might have married would be the one, then he might have stuck with whoever because it was safer and easier, in which case a part of the essential Jack would always have had to be suppressed and ignored.
All this is preducated on the romantic belief that there is only ever one who is THE one - in the ss and movie it seems as though that's true for J and E.
Well, in a certain sense, Lureen herself was a good match, no? If we forget the in-laws for a moment, Lureen's lack of interest in the marriage allowed Jack to do what he pleased.
The above might be a tad too cynical, perhaps. But I think there was something in Jack that made it easy for him to be "agreeable", even when all true deep affection had been lost long ago...
