Just talk to your friend and girlfriend seperately don't make it look like you're trying to kill someone just explain your point and concern and just gently give your friend the hint you don't really like the flirting even if it's just casual and as a joke. Don't involve violence it doesn't go anywhere..
Very true, and any advice given can just be in very general terms. However the fact that Jaxx felt the need to raise this on the forums tells us quite a bit about how comfortable he feels with his friend's flirting. We know that his friend is described as a habitual flirter, so it may be just his usual behaviour; he and his girlfriend may have a secure relationship, and this is just his way of socialising. Flirting can be a "safe relationship" because both can play a confidence-boosting game of mutual flattery while knowing it will never really go anywhere serious. He can't be too full-on either, because Jaxx's girlfriend appears not to have noticed anything before Jaxx told her. On the other hand, people can be innocent like that. They don't expect to be flirted with, so they don't interpret it as such when it happens --they think it is just friendliness. He does seem to lavish quite a bit of attention on Jaxx's girlfriend. Flirting can be a prelude to courtship --in this case his girlfriend would be the safe relationship in as much as that he has something to rely on until he finds someone better. Perhaps the chase is more fun than the being settled down... Most importantly, the birthday card not including his wife and son's names is significant, as is the winking --with these acts, he is delineating a private relationship between him and Jaxx's girlfriend that excludes his own girlfriend and son, and excludes Jaxx. Jaxx feels that some subtle boundaries appear to be crossed here and this is why Jaxx is feeling uncomfortable. Whether or not Steve's intentions and motives are pure, and he just sees Jill as a good friend engaged in an innocent game of "I flatter you, you flatter me", is not as important as Jaxx's discomfort with the matter. He needs to address this and get some clarification. If Steve can convince him that the relationship is just a friendship, then Jaxx can move on. If Jaxx cannot --well, then Steve needs to accept that there are some boundaries there that he has to respect out of friendship to both Jaxx and his girlfriend.
Once again Nexxo hits the nail on the head-more or less sumarizing the best opinions offered into one convenient, cohesive, easy to read piece of what should be common sense.