He might just be the kind to have a lot of friends online. I'm that way. and yeah, I can bounce between Instagram, WhatsApp, Discord, etc messaging different friends while I'm there. He might see his chatting life as being different from his real life. He might be protecting his sanctuary when he's in that zone but not connecting with you there.

All that is mights and maybes. You know he had bumble but he wasn't afraid to show it to you and say what it was and why. Sounds like you weren't on the same page about your relationship. If you weren't on the same page at that point, I'm wondering if he fully understands how his behavior is affecting you. He sees himself as just chatting with some friends and checking out some videos and not realizing this behavior is tripping your suspicions from a previous bad relationship. Make sure you convey this to him. Make sure he knows that's not just you being some silly girl but the scars left on you by prior bad experiences.

You are being highly suspicious and your mind is definitely taking the ball and running with this one. But you've got a reason to be that way. Make sure he knows what it is and is aware that he's walking through a minefield if he keeps going on this way.