I grew up with divorced parents, and quite a few of my school friends also had divorced parents. It made me quite paranoid about ever getting married, so I made a couple rules:

1. Live with the person first for a at least a year
2. Go travelling to another country with them (when I travelled alone I met a lot of people whose relationships had ended during their trip, travel seems to be a good "pressure test")
3. Make sure that even in the middle of the worst fights, I still wanted to marry the person. That I wasn't just marrying them for the good times.