First off, any guy that doesn't bother calling you is a jerk. If he decided not to
go out with you any more, than he needs to grow a set and tell you.
He handled this situation like a coward, therefore he is a coward.
So now you know he is a jerk and a coward, aren't you glad you are rid of him?
Don't let his behaviour affect your self esteem and confidence.
There are tons of guys out there just waiting to meet a nice girl.
Keep your standards high so they have to meet your expectations,
not the other way around.
And be aware of any signs (or red flags) when you first start dating someone.
As soon as you notice him acting like an idiot (for lack of a better word), bale and move on to the next guy.
Big hugs to you hun!