Hyper-vigilance is about it. Combined with a special awareness of how intoxicating NRE is. NRE can seriously screw up one's judgment, and make one incredibly insensitive, and ungrateful, towards one's established partner/s.
I don't know, maybe it also helps if one doesn't combine NRE with an extended mid-life crisis.
I don't know, maybe it also helps if one doesn't combine NRE with an extended mid-life crisis.