both of my crushes are dating each other and now i'm unsure about what to feel about it...

i'm a loner guy and made friends with a girl i met in highschool. i've had a crush on my girl bestfriend (let's call her "A") since we were in highschool. she was very smart and she understands people easily. when we got to college, i fell inlove with a guy (let's call him "C") in my class. he was very talented in arts, soft hearted, always smiles softly when we talk, and i also like his physique. one day, C came up to me and said he wanted to take a picture of me for a painting he's making to submit next week. it was so random but it was the time when we became friends. i introduced C to A but i soon regretted it because she said she secretly had a crush on C. A thanked me and i didn't really mind it. so, i've been hopelessly loving someone... twice. us three became bestfriends until the end of the year's semester ended when A confessed to C C accepted A's confession. A asked me personally to "support" them. ever since then, they've been constantly going out on dates and sometimes tags me along. why? to spend my money on their dates. i didn't mind it that much because my parents gives me big allowance and seeing them together actually calms me. though, jealousy disturbs me. a month later (today), A came in my apartment at around 8 or so in the evening without telling me. i was just sitting on my bed, scrolling through tiktok and shecame running to me. she cried while hugging me tightly, always apologizing for wasting my time and money supporting their relationship. she never knew why C wanted to break up with her. when she fell asleep on my bed, i decided to go outside and call C to know what really happened. that was when he told me that he never loved A and he was gay. he also confessed that he only played along with A to not hurt her or anybody's feelings. i understood what he said but i got kind of agitated by him. i was about to end the call but he confessed that he liked me from the start. i ended the call quickly and went back inside, racking up my head, almost crying, writing this while i eat fries on my couch. i don't know what to feel anymore T-T pls share some advice... (i'm trying to explain this as best as i can because i'm not good at english)