Just hang in there, bud! Times are rough right now, and I hate to use a quote from a movie, but,
"The night is darkest just before the dawn."
Right now might seem like a sh*t pile, but allow your friends, family, hobbies and yourself be the stable boys and begin to clean up the pile of sh*t. You can't get rid of it all in one scoop. It takes time.
I know how hard it is to have somebody manipulate you into believing that they are the one, and then they pick up their things and move on without even blinking. It's straight up ridiculous if you ask me! But, you cannot allow them to ruin your life, while they are obviously enjoying theirs! This is who she is, and yeah it sucks to find out that the person you loved was pretty much a fraud, but sometimes that's the way the cookie crumbles. It sucks to realize this, and it will take time to get past this hurt. And that is exactly what is going to heal this horrible sting. I just got some great advice not too long ago which has been helping me with the healing process.
"Start becoming the person that the ones closest to you will be proud of and respect."
If you cut yourself off from being happy because of your ex, then nobody will be given the chance to enjoy you for YOU! Life is short my friend, and it should be enjoyed!
Take more time to grieve, but don't allow it to be the only thing you do! Enjoy the beauty of life, instead of dwelling on one bad aspect. If you begin to be happy and surround yourself in things you enjoy, then it is inevitable that you will find somebody, without even looking.
Take care bud and remember to enjoy the beauty of the day!