The only thing MC gained from that is that he was strangely aroused, which was already present if you go for the no fun path.
(And the PTSD ofc, even if we only see it flaring up we don't know if it was there before.)
What lured MC into both Damian and jd is the obsession with pleasing Lacey, so SHE won't leave him (I know...).
With Damian was more tied in not disappointing her, with JD seeing how happy she was when discussing it.
So they were more of the same in my eyes.
Maybe he even started believing her "creative" ideas about helping him with his jealousy, this might fit with your idea.
And both these events are not just vibing cuckyness, they are exuding cuck juices all over

.
Just read when he talks about letting her dance with other men, "I want you to have this", "is this good?" , "not normal enough?"
From that point on the cuckyness has been instilled, a married woman has no business dancing in clubs with random men that want to bed her, it is not what normal people do.
That was the turning point for me, a bit more subtle, but it shows how this "jealousy bad" concept has intruded In MC mind to the point where he has no idea what he is talking about anymore.
Normalize jealousy pls, it is a normal emotion that MC has all the rights to have.
And I am not even sure we can call it jealousy btw, fear of being abandoned != Jealousy.