Dont feel like you have to evaluate potential spouses, but pay attention to your gut feelings. There are varying degrees of personality disorders. The main thing is to love yourself enough to be able to get out of any relationship quickly that is causing you harm. Like, sometimes it takes years to spot a narcissist, but a warning sign is when you can tell that their compliments are more flattery than from the heart. In that case, get out before it gets bad, listen to your gut.