What is it called when your not dating someone?

Situationship Is The Term For Your Undefined Relationship.

What does it mean when he says hes not seeing anyone else?

What he is actually saying to you is that hes not seeing anybody else, he is spending time with you, but that doesnt actually mean that hes committed to you. If you pushed the issue further and asked if this means that youre in a committed relationship, hed probably cack his pants or dodge the question!