Firstly, it is not wrong to feel agitated, frustated, sad, lost
and lonely when such things happen... In fact it can all be summed
up to say that the feelings are insecure...
The wrong thing to do is to compete with the guy which may end up
in brawls rather than brains. Try to show the girl what she means
to you and behave in such a way that she knows that she is safe in
your arms 