When a guy tries to swoop in on a girl I've been talking to, what should I do?

What's the best way to react, or is it best to just do nothing at all, i. e. not reacting and not looking or staring?
Updates:
+1 y
Because the guy who immediately starts paying a lot of attention might indirectly let her know he's jealous, and she might like that feeling (ahhh... he's jealous, he likes me)

Or is it best to be poker faced? and will the guy who doesn't react or act jealous end up being the guy she chases?
When a guy tries to swoop in on a girl I've been talking to, what should I do?
1
2
Add Opinion