"Dating someone" means you are involved with someone.
"Seeing someone" means you're a sicko-pervo stalker voyeur dude.
The situation may seem hopeless, but there are ways to approach the situation tactfully.
In other words, seeing/dating someone implies that you haven't decided to make this an exclusive relationship, at least not yet. Seeing someone is a steady relationship that comes after you have dated.
If you were thinking about a future with this person, then you would use other terms that would indicate that you were serious about this relationship and thinking about a long-term future. Dating is dating, in that you can date several people without it being a serious relationship. After a while, you want to go from just dating to a more steady and monogamous relationship without being engaged to be married.
She said, "We've been seeing each other on and off for two years! For a man it was come to my house bring food get naked.
" 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.