<human>: Can you condense the text into a few key points?

I know based on the title it sounds obvious, but here is the backstory. I just left for Japan for a year to study abroad a week from today (a week from tomorrow in the US where i'm from) and a few days ago my girlfriend or lover told me that my friend asked her out. I wasn't sure what to think of it and most of my anger was toward my friend because I have known him for years and that was really weird and confusing to me that he would do that. I confronted him via facebook because that's all I really can do at this point other than skype and he said she was hitting on him and he was just seeing how it would work out, but they both wanted to know how I felt about it. That seems sketch to me especially since I wasn't gone even a full week at that point. It just seems wrong and that they were waiting for me to leave and they had this sudden guilt about immediately. I honestly don't know how to go about this or if i'm doing the right thing. I'm the kind of person who needs every detail to make sense of a situation and the fact that they're leaving something out doesn't seem right because they both now that about me. To give you some more details I have known my friend since 8th grade and were both juniors in college, and I have known my girlfriend since freshman year of college. Also they have only known each other for two weeks. the two weeks I visited the school we mutually go to (my friend recently transferred from another university). I have both told them already that if they don't give me both details i'm just going to stop talking to the both of them. Am I going about this the right way?
<bot>: Girlfriend and close friend suddenly have feelings for each other now that i'm out of the country, but neither one wants to tell me whats going on.