My first love broke up with me suddenly. Need advice what to do now?

You need to start building your confidence. As much as I hate to tell you ? I think she moved on. She was dishonest with you and that is not acceptable. If your hair is thinning ? Shave your head and get a new look. Dress a bit different and start looking at other girls. Many men's hair thin, nothing wrong with this. In time you will forget her. She needs to reimburse your money !