... [I] get really mad at him and tell him I want out of this M and want to start over wth someone new that loves and appreciates me... Life is ahead of me and dont want to waste it. I dont want to settle!! ...

This is the sort of knee-jerk reaction and threats that's probably very hurtful to him and could drive him to say or do something hurtful back, even to infidelity again (at 107!).

In all likelihood if you are patient then wisdom and forgiveness will come to you one day at a time or perhaps suddenly. Perhaps as a result of some life-changing event where you get to see his better side. (Perhaps he'll be good with the great great grand kids)

You are at war, keep up the fight!