Why some marriages don't work out

There was a post asking why  so many new marriages with Filipino women end up in divorce.

I think  the most common reasons for any relationship to end are: 
1. They didn't get to know each other
2. They have not much in common, or are very different
3. Unfulfilled expectations
4. An affair.

The more reasons, the more likely the relationship will end.

My husband and I have a lot in common. We are both GenXers (4-year age gap), so we grew up liking the same music, movies, tv shows, etc. We got to know each other very well before we decided to get married. We met each other's families. We had the same goals in life, and easily connected with each other both spiritually and intellectually. When I suggested he and I move to the Philippines because my parents can help us and that we could have a better life there, those two things did happen.

I think the only reason I would file for divorce is if he gets involved with another woman.

I'm pretty certain one of his former co-workers has a big crush on him. She even organized a party for his birthday. She still wants to meet up with my husband, inviting former co-workers to join  so it wouldn't be awkward. 

She's pretty and young, but they have not much in common. This loud karaoke-loving girl, who would comment on a movie as "it's great" or "it's good", is just not his equal. We'll see. Maybe just being pretty and young are enough to leave me and other things we have behind.