Reply2:
"What if he falls in love a fifth time?" this goes endlessly, unless their is a limit.

Each system puts some limits:
1 in the west
4 in the east

And do you really think that falling in love happens that often (5 times)? or that getting married is such an easy thing to do (properly)?

"Would you advocate a second marriage for her too so that she wont cheat?"
No, I cannot advocate something I don't believe in. That wouldn't be honest, would it? :D

I have other reasons, but would prefer to research before publish

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"The larger grows the island of my knowledge, the
longer stretch the shores of my ignorance."