What should I do if I'm confused between my guy bestfriend and the guy i'm dating?

For context, I've been always in constant communication with my guy bestfriend for quite some time but since January, he really has become someone who shares my pain constantly. We both had traumas and anxieties and various sicknesses so we both could relate to each other and can discuss tips on what to do.

For sometime he has fulfilled the emotional intimacy that I need but sometimes I do get the feeling of missing something and it so happened one of the guys i dated in the app sent a message and the rest is history we've been talking for 3 months now.

The guy I dated is surprisingly serious about me and at first I didn't even thought seriously of things until when he got upset at me for a lot of my inconsistencies and decided to not message me. So i pursued him and somehow we already have a pet name for each other.

The thing is just when we had something great going with the other guy, my guy bestfriend who i vented to about my anxiety issues suddenly step up the game and sent long messages to comfort me with what I'm going through and coming from someone who has it too, i just feel comforted and loved a lot.

It's as if my guy bestfriend can fulfill my needs for emotional intimacy alone and that's what's weird about it. I don't think it's fair for the new guy because I do like him but a part of me could just tell that we've been trauma bonded with my guy bestfriend so it's really hard. My guy bestfriend has expressed he's just a call away and was really worried with my recent episode attack. I share some of my issues to the new guy but I'm having a hard time being as vulnerable.

What do I do?

What should I do if I'm confused between my guy bestfriend and the guy i'm dating?
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