Dawn asks, "What is your opinion on flirting with others when you're in a relationship? I have a friend who's been dating a sweet young lady for about a year, but he flirts with other women-- including me-- incessantly. I think flirting with a stranger is OK. You see an attractive person in the store, you smile at each other, maybe have a very brief conversation, and never see each other again. It makes you feel good about yourself and gives a little lift to your day. But flirting with people you know is risky; there's a chance that it could turn into something more, and it's simply disrespectful to your partner. What do you think?"
My opinion is short and simple: if the 'sweet young lady' doesn't have a problem with it, then its really of no consequence to anyone. If they've been dating for a year, then she's well aware of her partner's flirtatious nature. If it was a deal breaker for her, then I'd hope she'd have either spoken to him about it, or ended the relationship. Plus, for all you know flirting is okay in their relationship; I have a male friend who is also dating a nice young woman, and they've agreed flirting with other people is okay just as long as they are both sexually faithful to the relationship.
Some people are natural flirts. They aren't doing it to offend their partner, they are doing it because that's who they are: outgoing, friendly and teasers. These kinds of folks are harmless and aren't going to let flirting amongst friends "turn into something more", because frankly it takes two to tango. Its the folks who hide their flirting from their partners that are of more concern - but a concern to their partner, not to you.
If this gentleman's flirting with you is bothering you, I would recommend speaking with him briefly about it the next time he flirts with you. Let him know you don't feel comfortable and if he blows it off as nothing or it being harmless, just smile and say you understand, but you'd still rather not be flirted with. If he continues to flirt with you after your conversation, slowly start spending your time with other folks, or at the very least do not allow yourself any alone time with the man.