What does it mean when your boyfriend flirts with a lot of other girls?

I'll tell you simply what it means. It MIGHT not mean anything. It's possible that you kind of overestimate how much he likes other people. But overall, tell him exactly what you're worried about, be specific... if he doesn't stop, you should ditch him.

I think that it is extremely rude for a person to do that especially when its in front of a girlfriend. It could mean a number of things. I would just ask him first why he does it and if he is trying to tell you something. When I had a girlfriend I would look at other girls but I wouldn't make comments to them and it was only cause I was curious about the people around me and it wasn't like I was checking them out.

Thats very rude. yes my guy does make comment sometimes about how hot that girl isn't its not like he going up to her and flirtin with her he really just teasin me. If he does this when you are around what he doing behind your back.

Be careful about that. Sounds like he's a player. Don't put up with him doing that. No girl should EVER have to be treated like that.

Confront him why he says that,
and tell him how you feel.
if that doesn't work, and he keeps on complimenting and flirting with other girls,
break up with him.
there are better guys out there.