Anything about the OM should make you uneasy.
I have a similar sitch (see my signature)
OM was W's first H, only lasted 2 yrs (I think)
That was almost 25 yrs ago!
Then d-bag pops up out of nowhere.

Let me ask everyone on the board no matter how much you contributed to the problems in your own M.

What kind of a person persues a R with another man's wife?

What kind of a person does that even when they are still married to their own spouse?

These OM/OW are illigitimate as far as I am concerned, and do not deserve a single microsecond of thought polluting your mind.

Just my 2 cents.
Pickle

Me 53 XW 50
M 18 Years +2
S14 D19
Bomb 10-24-10
Served 1-27-11
Mediate 4-21-11
Civil D Final 6-2-11
No church anullment
"A man is not finished when he is defeated, he is finished when he quits."