I'm kinda confused please need ADVICE

Ok so, about an year ago a guy confessed his feelings to me and claimed the he's been into me for about 1 year but I friend zoned him. Everything was perfect, we use to chat together, play video games, flirt a bit, he even helped me with my depression. And soon after few months he moved on. BUT NOW, I've developed feelings for him and he's gonna leave the state in 1 month and we can't meet due to covid. I'm totally fine with rejected, being friend zoned or long distance relationship cuz i just want to let him know how I feel. But I'm afraid that if i confess my feelings to him and he accepts me then after a certain amount of time he'll feel like he's stuck with me. And if he rejects me, he'll probably think of me even before starting a new crush. BECAUSE, when he'll move he'll meet new girls and have a totally different environment, and probably he wants to leave everything behind and start new. I'm just afraid if I'll be holding him back. Should I let him know how I feel or not? PLEASE GIVE ME YOUR ADVICE.