I saw that you gave some good advice on another thread about depression
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Having some special project to work on also helps. I try to help other people and finding out that some people have a worse situation than you do and they seem happy does seem to make you feel like you have to put your life into perspective. You have to get a support system of friends or family who will help you change your situation. I remember living at home, working at a job I hated and having no boyfriend and I felt like I just had to endure it all. It took a while bit the situation changed...
You have to let go of the past. The complications around your previous love affair are not fixable. Join some clubs/associations and meet new people. You may even meet another man, if not directly, then through your new contacts. That is, if that's what you want. Even if a woman is single today, she can lead a fulfilling life,
Best wishes.