<human>: Can you provide a brief rundown of the text in within 3 sentences?

I moved recently to Thailand. I've met here a guy, which seemed to be a great friend. Let's call him Frank. He has many hobbies, funny and carrying. The only issue he has is being overweight. I work as software developer remotely. At some point my boss comes to Thailand to relax and discuss our project. Frank shows some interest in project as he has some experience in web development and project management, so we discuss it together a couple of times. Frank also complains a few times that he is not satisfied with his current position and wants a better job. I say he deserves it, just smile and do not pay any attention. A few days before my boss leave, Frank called him and asked for a meeting. After that meeting my boss met me and said that Frank proposed himself for a managing position at our project. He somehow gave estimates on our project, even he doesn't understand it properly and was self delusional in many ways. Essentially, he wanted to be my boss! Moreover he told my boss that I can work harder and my code is not that great. Well, we don't work in the same space, so he has no idea how much i work and he never had access to any of my code to make a code review. Beyond that he is not qualified enough to do that. My boss was furious about Frank and told me he doesn't want to see him at all anymore. Good news he is leaving in a few days. Here comes the hard part. I am absolutely disgusted by what he has done. I have no explanation for such move. He must be really desperate and in a great need to do that. It seems I don't know him that well, as I thought, but It has been only two months.

What should I do now? He doesn't know, that I know. Do I confront him? I don't think it is good idea, because in this local community he is well know and well respected and I am a new guy. I think odds would turn not in my favor, because there is no hard evidence. And many people would just blindly follow and trust him anyway. I also don't want to interact with him anymore but I need some sort of explanation.
<bot>: Moved recently to Thailand. Met new great friend. He betrayed me by proposing himself to manager position at my project behind my back.