Was just gonna come say this.

Sure, it doesn't really make sense, but for all we know it was still a fairly fresh wound. And even if it wasn't - There's no timer on how long it takes to heal. Had a coworker who went through something similar, it has been something like 10 years and he still has trouble thinking about dating again. He returns to the thought about him "betraying" his spouse - Even though he knows with absolute certainty (and his spouse told him beforehand that it would be ok) that they would never be angry about them dating again after they passed.

It's just how our brains are wired.