Obviously, he's after getting odd over you talking to his friend. Even if it is online, I can understand how quickly these things can get so real so fast. But he had his chance with you and he's blown it now. Why didn't he keep talking to you so much from Oct to April you didn't have time to talk to anyone else? I know a couple who chatted online for a year, [became so involved with the person they introduced me to them on Skype!], moved country and flew to meet them and got married. You can easily get snapped up, unless he's keeping you entertained during Quarantine, which you did. His loss. He's a sore loser.
If it was a big emotional connection for the both of you something like this would have happened. It just didn't for whatever reason - maybe it just wasn't meant to be.
It's easy to overthink this one, but don't bother and move on. Date the other guy. You're a free spirit until someone claims you and you both agree to be exclusive, or have some little chat about it, which didn't happen.