If your married ex-friends that boxed you out become divorced and single again. Then decide to hit you up, are you going to give them the time of day? I don't know if I could or not...
Mostly every never married/no children man who is 35+ has seen this situation at least once. A lot of couples start divorcing around 35-40.
As a late 30s man, I have had friends/family already do this to me to some extent. None of the people who have married, ignored me while married, and then talk to me again after the divorce is filed live in the same city where I live. When they have increased interaction, it has been calls and texts.
One of my college friends (not one of my closest friends while in college) caused an unintended pregnancy within 2 years of his college graduation and ended up marrying the woman. Predictably, they got divorced but not before adding more children to the mix. I went years without having any interaction with him. We did talk again once he got divorce and do text message each other.
Both of my divorced cousins started interacting with me more when their now ex-wives filed for divorce after having minimal interactions with me during their first marriages. The older of the two went exclusive with a woman in between divorce filing and divorce finalization. He re-married fast. The increase in interaction was quite short lived. The younger of the two has yet to remarry. The interaction increases were not that meaningful in general.
@DonJuanjr -- You are correct that it is emotionally difficult to deal with these married men who disappear during their marriages. It's hurtful. I realize that it is typical beta male/beta-ization behavior to disappear from your unattached/marginally attached friends while married. Even unmarried guys in multi-year LTRs do this as well, often to re-emerge after the relationship fails. Romantic relationships ultimately fail. Male friendships have a better chance of outlasting most romantic relationships that have started in the 1990-present era.