Guys and Girls here. i need ur help or more of an advice. let me start my story first. me and my girlfriend are together for 4 years now. we've been through a lot of ups and downs together. we love each other enough said. recently starting this year, i've got myself a permenant job and she furthering her studies in UK. At first we take the long distance relationship quite well with communicating via phone, sms, and mostly instant messenger. i usually woke up in 4am just to have a chat with her through IM until 8am. she had a trouble adjusting in new world with different environment, weather, no friends or aquintance, and most biggest is homesick. Things getting uglier when my job starting to demand more of my attention and got the better of me when a new project were assigned to me. i'm starting to lose focus on her as my boss often breathing down my neck for progress. i've started to woke up around 6.30am as i often sleep late around 2am or above due to overtime work. things were not so bright on her side either as she's getting more homesick, miss her family, friends, me and her experiment (she's doing PHD by the way) doesn't produce result like the way she've wanted; and i'm not there to cheer her up when she's down. so, after awhile she's beginning to act cold towards me, saying things that is 'empty' and hurting me. her words often makes me feel guilty. she also stop saying that she love me. i was wondering where could i've gone wrong. then after yesterday slow talk with her, she finally admit she's being cold because she doesn't want to hurt herself. she was crying a whole week last week and tell me that she thinks i'm not ready to be her gf. i was shock and i asked her why but i never get the answer. so guys and girls here, i need your advice on what should i do now. i don't want to end this relationship. not like this. thanks guys.

thank you so much for a very good advice. i will put it into action right away.