After the debate on Monday, Trump tried to be all "high and mighty" saying he did not bring up anything about Bill Clinton's infidelities.

First off, pot calling kettle black? A dude who has had multiple divorces is not in position to call out anyone's infidelities. 

Second, I've never got how people have issue with Hillary over Bill's actions. Particularly since such accusations usually come from people who espouse personal responsibility. 

Bill is ultimately responsible for his actions, not Hillary. Marriage, like all relationships, takes work and it isn't "one size fits all." Things like trust and loyalty are important parts of marriage, and so is forgiveness. 

Even if, as some people claim, Hillary only hangs on to Bill for her own ambitions, in what way does that affect how she will be President? And frankly, if you have an issue with how Hillary handles her marriage then you must also have issue with how Trump has handled his marriages, otherwise you are just being sexist. 

None of us are in a position to question the reasons why one chooses to forgive, and Christians ought to understand than this better than most.