Some men can shag anything with a pulse.Should I be horrified he slept with someone so gross, or is that just how men are?
For some men and to sleep with a woman, they need have no feelings nor the emotional bond - they are merely satisfying a sexual urge and they can walk away from that woman afterwards and never look back.
If this was my fella and this woman is as gross as you say, then I'd cringe everytime he went near me. In fact I doubt I'd let him near me again. If he could screw someone so gross, then IMO he was capable of screwing ANYTHING ...that would put me off.I wouldn't be able to get passed something like that.
I'd dump him.