My heart got craved out today

i found out my ex has a boyfriend already. I still having a hard time getting over her and i can't believe she got over me the second she walked out my front door. I poured my heart out and this is what i get. Am i not worth remembering. my chest hurts, i can't find any motivation to do anything. How could she be everything i was looking for and dismisses me so quickly? it was so hard to finally found her, will i ever find the right girl?
my self esteem is at the all time low. I hate how relationship works, it's so much lies and holding back and games. why can't people just be open, honest, and happy. it really makes me wonder if there is something wrong with me. Am i not worth it even for the girl i'm looking for? I can't stop thinking about how happy we were and how perfect it felt like and all that meant nothing to her. how can i ever express interest if all i could expect is to be rejected again and again?
Everything i believed in contradict my experiences.
Nothing seems to matter now and i slowly loosing my will and motivation to do anything but rotten away and be sad. Why was the best of me not worth anything to the person i love? I don't know if i could be happy ever again.