what should i do? my girlfriend is emotionally attached with somebody.?

[Bob]

We've been together for 4 years now. I'm working abroad and I left her last year to help my family and to save for our wedding. but we always communicate through skype. but sometimes I don't have time for her because of the time difference and with my schedules at work.4 months ago she had a new friend who's always there for her.the guy told her that he likes her and my girl said she have a boyfriend. she did not tell me that we had a problem and shes always crying because of how much she misses me.and then instead of telling me the problem, she's telling her problems about our relationship with this guy. now this guy likes her. he gives advice, takes her out, gives her presents and making her happy. now my girl is emotionally attached to him right now and she told me the truth 3 weeks ago and asked me some time and space to figure out if she still love me or not. instead of understanding her. i got angry of her. i said bad things to her, because I'm mad. and that's normal. She said its not healthy anymore and maybe we need to stop,but I did not agree because I love her so much. But everyday seems a nightmare, I'm so depressed, I cannot eat, i cannot concentrate with my work. I'm always crying and I keep questioning her about that issue, she told me everything i needed to know. they didn't had sex.they never kissed. they see each other but its not a date.they are always with group of friends. the guy calls her everyday. they are chatting on Facebook and shes very happy. She gave me her password and I do Sherlock Holmes. they had many pictures together and she smiles very happy like the way she smiles at me before. I'm so hurt and jealous. she feels sorry for what she did but admitted that she's still emotionally attached to this guy. but she stopped communicating with him because i asked her to stop.
I want to trust her again and make our love start again but everyday my mind is saying that shes not
telling me everything. I'm still crying and can't sleep.I want to forget the past but i'm so paranoid. i'm not angry with her anymore but I'm still angry about what she did. we are still together and I'm trying to win her heart back.. i always call her now and we always do skype every night. but i still need help because the past always ruin my day and i am afraid if i can't control it and get angry again with her.she will break up with me and leave me forever. we are in a long distance relationship and its very hard for me right now to be alone. I am always thinking that its all my fault and i pity myself of leaving her and not giving her all the love she deserves when we were still together. i need to finish my contract and i have 10 months more before i can see her again. please help. i don't know what to do. i know she still love me and i love her so much. but its really painful because of what she did. I am so depressed.