My dream girl broke my heart. how do i cope with this?

my gf of 7 years broke up with me for the sixth time. 2 years into it she cheated on me. i took her back. every year since she liked other guys or needed space. now i lost my job(downsizing) and instead of helping me out she left me for a guy with money. im only 5 ft 2 and skinny and she is tall 5 ft 9 and skinny and really hot. i treated her like a princess. she was my world. i love her so much and i will never find a prettier girlfriend plus i now think all women act this way. i keep having nightmares about her with this other guy. it has been a month and each day is getting harder. how can i cope with this. im so heartbroken.