I M 24 Years Old..actually I Had An Affair...but For

I m 24 years old..actually i had an affair...but for some reason it didnt work out..but now i have a fear about boys..i have lost self confidence..i cant sleep well.i m depressed..i dont like to do anything..i feel always cring..i feel alone..pls help..i mliving my lifebut im not enjoying...how to get rid of it????