Most Helpful Guy
When I lose a girl i really liked my thought process will be like this: Fine, it's her loss. I know myself and i know many other girls would love to have me especially when they know what i'm all about.
i also find it really helpful to use that as a fuel to better myself, all the sadness/anger i have turns into an explosive burning fuel that i'l use to better myself and exercise HARDER. When i exercise really really hard and push myself to the limit i become very satisfied of myself especially when i realize i exhausted my arms or legs too much that i can barely carry a plate of food without my arms shaking, my satisfaction increases even more when i wake up the next day really sore. Just 5-6 days ago i lost someone i really liked and that made me break a lot of personal records because of all that extra energy i had from my feelings. All that in turn makes me way more confident because i know i became stronger.
I just hope u play a sport or something so this can be helpful for u :p , if u don't then i suggest u start doing some. There is no better feeling than having self satisfaction, when u r satisfied with urself and who r u and know what u r capable of... there will be no one that can put u down.