How can I tell if I should break up with my fiance?

This can be really difficult to figure out, but you want to look out for red flags. If they're always trash talking their exes or they seem really resentful, it could be a sign that they aren't mature enough to be married. Another sign could be if they're always talking about themselves. If you're worried about dog being sick and they turn around and start talking about a dog they had growing up, that's a bad sign. A lot of this comes down to your gut, though. If you're thinking about breaking up with your fiance, it's definitely a sign you aren't ready to get married, though. At bare minimum, push the wedding back while you evaluate your feelings.