Morals & Beliefs.

Everyone comes with their own set of morals and beliefs. We all know that we should be open, honest, and accepting of others. But oftentimes when our core beliefs differ, it's hard to have a lasting relationship. This is why you'll want to have deep discussions about faith, morals, and beliefs with him. If he isn't a fit at this deep of a level, you should seriously consider whether the relationship is even worth getting serious about.