No, not at all. Actually it is pretty natural - just because he broke up with you doesn't mean your going to feel anything different than you felt just before he did that - feelings don't just go...
Tell her you still have feelings for her, talk to her about the reasons you broke up, and how you can prevent it happening. don't give up easily. good luck !!
She broke up with you but it doesn't mean she can't call you. She is in that stage where she probably can't help herself and/or can't chose between you or another. It's a hard situation, but just get...
If your ex has a new girlfriend then it's unfortunate, but you will have to respect that and move on with your life. If he does not have a girlfriend then contact him and see if he will meet you...