Shud I rite 2 the guy i broke up wid who is in USA while im in India n demand an explanation 4 wt he did?

i ws going arnd wid dis guy 4 a mnth it ws like a live in reln.he ws frm my college.he had 2 leave 4 UK 4 his PhD.i nvr forced him into giving me any commitment but he alwez sed he wntd 2 b wid me etc.dis ws a reln i really had expectations frm cz i had a bad reln in d past n i ws gettin in2 a reln after 6 yrs.wen he left dis place he kept sayin evrythng ws fine but den he broke up wd me n d fone dt 2 wen i cald..nw i c he is havin a blast thr while im still tryin 2 figure out y i ws treated like dis.i ws devastated after i gt 2 knw dt he ws jus foolin arnd wid me n he sed all dt jus 2 sleep wid me...nw shud i mail him n ask him y he did all dis or jus let it go?he wnt b bak b4 4 yrs so thrs no chance 2 get back 2gthr but wat hurts me is he lied 2 me thruout d time we spent 2gthr...he nvr mailed me /cald me after leavin india..his beahviour shockd me..i guess evry1 deserves an explanation as 2 y sum1 played wid their emotions but i dnt wnt 2 lose my self respect by nagging him.