Advice For A Cute Guy

I apologise in advance for length. I’d like to split this post into three main parts: Backstory, Arguments and Exploration.So first a little backstory:We met years ago at the beginning of school by chance. I quickly bonded with people in his friend group but never directly contact him, his beauty was too intimidating. Even then I knew I was bi. Over the years however he’d randomly message me on Messenger with random cute emojis and messages telling me that he wants to “share a bed” and would change my chat nickname to kinky stuff. However I fell out with his friend and we separated. Over the upcoming three years he’s often make nasty remarks about my long hair and a particular jacket that “ makes me look like Hagrid”. It wasn’t until I got Snapchat and has randomly added him that we started properly taking. We would tease each other with side pics of our upper thighs and just showing pubic hair. This continued throughout our on and off arguments. Until one day we FaceTimed and showed each other everything.Arguments:One argument which shapes this entire thing. So after exchanging picks for a good 20 minutes he tells me some girl is messaging him and he tells me to go back on my console and leave him be. The next day I freak the fuck out at him and asks him what’s his issue and he tells me “he only likes guys when he’s super horny”. I don’t know what to make of this. Is he exploring sexuality? Did he ever like me? We stop talking with on and off arguments for several months until December.Exploration:Halfway through December he sends me a random snap in the morning with two letters “Ft”. I tell him yea and he unblocks my number and we chat and exchange pics for thirty minutes. He then abruptly ends the call. He patched me for the next month until I messaged him two nights ago on Snapchat saying “ Do you want to talk again?” He goes on telling me about his friends, my former ones.So, now with all that data, my questions are-How do I make my feelings clear to him? I do like him and think about laying next to him so often.How do I find out his sexuality and if he’s interested?How should I ask him out and make my intentions clear that it isn’t anything less than a date? I want to be with him more than anyone before. I do have an active girlfriend that he doesn’t know about though.