I have no idea what this Leo guy is doing?

I'm an Aries 😄 , So there's this guy I used to work with(hardly 10 days), we're doctors and he's my senior. He never spoke to me, lol. He actually knew me from before hand when I was helping out a friend and he noticed it was late and he offered to drop us home, he remembered my name and everything, although it was one encounter months ago. He's known to be a player, so I never took much interest in him beyond friendship. In my experience he turned out to be really different. We would talk all night(despite him having exams), do things to make me happy, made my birthday special. But then I had to move away. I never expected him to stay in touch with me, but it's been 10 months and we talk everyday. I visited that place a month ago and although he's super busy he took out time to see me. A week ago he was drunk and told me he really likes me and always wishes I was there with him and that i send him pictures because he wants to see me and then I think he was trying to sext me but then said he shouldn't say such things and he'll talk to me tomorrow. It is REALLY difficult for him to say how he feels. I didn't acknowledge it the next day and then I didn't hear from him for a week. And now he's being difficult. Plus he's lying to make me jealous (for a fact) and saying things to piss me off.

I just don't understand what a guy who changes his romantic interest every other week is doing with me for almost a year now. He's known to be super rude and here he is supporting my dreams, helping me believe in myself, solving my every problem over the phone whether it's big or small. We've had horrible fights but keep going back. And i may never even see him again so I don't understand why he would even play me. I accepted I'm just a friend to him, but his random outburst is screwing with my head.