i dont think anyone should go into a marriage thinking of divorce.
I don’t think anyone goes into marriage thinking of divorce. For one thing, I think it’s against halacha.
I’ve a relative who got divorced after like 13 years and a few kids. I imagine he can’t regret getting married. He lived. He wears a tallis. He doesn’t get gellila.
I’m sure the person the OP referred to did not go into marriage thinking “in 13 years I’m going to get divorced.” It seems obvious s/he tried to make the marriage work.
The question is, is that better than never getting married? The answer is an unequivocal “yes.”