Allowing another person to control your happiness is the biggest mistake to make.
Happiness has to come from within, don’t ever give someone that much power over you. People are only temporary, you have to live with yourself forever.
Some things you can do with yourself to keep your mind occupied off of those negative thoughts:
-Read a book
-Go for a run
-Watch a movie you love
-Do your nails
-Find a hobby you love and practice until you are perfect (for example; drawing, painting, playing piano, golf, yoga, dance)
Find what you love and do more of it! You deserve it!