i think...(i thinkkk!!!)...u got some sort of separation anxiety
. i'm not quite sure abt this tho...cos when i read ur post, it reminded me of my houseparent's dog (rrr....i'm not kidding...so i'm sorry), he was diagnosed to have "separation anxiety", cos he barked all the time when my housparents were not home. he was prescribed with some medicine (dont know what...i think anti depresant or something...), he became alot calmer. (sory again..but i didnt mean to relate u as a dog ...really!)
i guess it can happen to human too, eh? to be honest, i never "cry" when i said goodbye to my bfs after we went on a date. i suppose u might have to see him a tad more often? once a week probably isnt enough for u. i know my friends meet their bfs almost everyday.