You need to back away and leave him alone. He is going to do what he wants to do and all the pleading is not going to stop him. It is making things worse. Men really hate that and see it as "nagging".
Your best shot at a second chance is to work on your self improvements, becoming the woman "you" want to be. Focus on your education, etc. Find information in how to be a woman of confidence and then apply that in your daily life. Men find women who are confident very sexy.
This will not come about over night b/c your H needs to be away from you and to miss you. When he hears about you through friends, or he runs into you at a bar or whatever, he will discover you really have changed from your clingy ways.
When you immediately stop contacting him, he will probably be relieved, but he may also wonder why you pulled back.
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I think Sandi has given you very good advice here.
