Maybe you are also seeing/dating someone else as well or maybe not.
However, you would use these terms if the realationship was young or if you were not yet serious about this person.
" Friend: "To a guy, that means: When I have a buzz on, I'd like to see you with your clothes off." I've never been able to hear someone use that expression since without laughing. Seeing someone is texting them drunk at saying "what are you up to" then heading to their place for sloppy monkey sex and waking up the next day then leaving before traffic gets heavy.
Dating them means you have to stay for breakfast Dating is a form of human courtship consisting of social activities done by two persons with the aim of each assessing the other's suitability as a partner in an intimate relationship or as a spouse.
Basically, there is no difference; just a difference in terminology.Indeed I know of many people who go from such an exclusive 1-1 state to an open polygamous relationship.