Break up.
If your feelings are genuine, when he returns, he should ask you out again.
It is not fair to suffer that separation. This is not to say you cannot have any contact... but this way you won't cry your eyes out if he forgets to call at the arranged time.
To be honest, if your asking it on here its probably best that your single
there is nothin you can do about that you need to change before you try to get him back and maybe he will think about how much of a mistake it was to brake up with you
slap him
Yes.
Because you love him and care for him.
When your boyfriend finds someone else and leaves you this means that he is not interested in you anymore and he wants to move on and there is just physical relationship in his mind that matters for him.
Get over it and find someone else.
Either stop arguing or find new boyfriend.
Go out with your girls and forget about him.
And you care why?
The one who leaves, as the one who stays not necessarily knows you are going somewhere.
It's called abduction; its a felony.