We are both married and planning to leave our spouses.
So the following suggestions are meant for you.
It's good to know i'm not the only one facing this.
Try to accept that, sometimes, they really might just be tired or not in the mood to talk — or that whatever's bothering them isn't about you.
If their actions are saying they are faithful then there is no reason to believe otherwise.
Earning his trust is the only first step.