how do i move on?

[louisa]

my ex dumped me about 4 weeks ago, it was random, but what triggered it was the fact that he was moving away for work, so it meant lots of time apart which i wasn't happy about but was willing to compromise. he later decided to end the relationship because of this reason, that same day and everyday before that was perfect nothing was wrong and then boom! i never really got over it and i still can't seem to be moving on, iv deleted Facebook because i don't want to be stalking him all the time and seeing what his unto. anyways i just got on Facebook because i was really bored and of course i came across his fb so i started stalking and iv noticed he's friends with his ex gf... iv sort of death with the pain these couple of weeks but my heart feels like its shattered into a million pieces again. his friends with her brother and sister and everyone again. i know he was never over her, i was always insecure about that, and this just proves it. my question is where do i go from here, i know it sounds silly but i have this dumb heart that just doesn't seem to get over things and i hurt for a long long time and i don't know what to do. please don't say move on, as i don't know how to, people around me cope with these things so easily, and here i am still heart broken and i don't know how to let go. please please if there is something out there any information that will get my mind off it will help, i don't want to hurt anymore, i don't want to think about him, i don't want to care that he's back with his ex.. i know its normal to still have feelings, but not when it was a short relationship and you can't seem to let go of it, he was with his ex far longer than we were. also how should i act if i ever see him? what should i do.. i also msged him after the break up once he never got back to me. so he obviously doesn't are to reply back, should i even say hello? I'm just confused because he was ALWAYS ALWAYS the one that would contact me and tell me how much he cared about me, and how much he misses me, wanted me to meet his parents, wanted me to meet his friends. thats why I'm so confused. please help me i really am desperate to move on and i don't know how. also if it helps he has bipolar condition. if anyone knows its something to do with the condition please leave a comment i would greatly appreciate any info!!

thank you