Search Results: how to flirt online relationships

I went on a date 2 days ago, it was way up there in comparison to previous first dates. We just clicked instantly. We ended up spending 7 hours together, visited 3 different locations. There were no silent moments, I smiled until my cheeks hurt. He didn't directly flirt with me but would tell me that he's so shocked by my intellect and how well we connect and when time ran away from us he told me that he didn't want to leave, that he really wants to see me again. There were moments where I'd express an oddly specific opinion/perspective on a topic and his mouth would drop, and he'd ask where I came from as if I'd just stolen the words out of his mouth. We didn't kiss, but he sat and played guitar for me and swooned over my music taste and my philosophies and every little thing we have in common. I really FELT the connection. He's also a creative, and more of a doer than just a talker. There's enough evidence to back that up. He told me he finds me attractive, too.

Here's the problem though...

He told me that his last relationship ended 6 months ago partially because he is so dedicated to his craft that sometimes he'll put his phone down for days at a time to finish a piece, that he isn't much of a texter, and that girls don't understand this about him and it causes tension. Fair enough, I thought it made sense. But on the date he showed me some of his artworks hidden in his chats and i didn't see much but he didn't look like a bad texter. Even so, ever since our date, ever since he told me how he's so ridiculously keen to see me again and we're going to make all these plans together, I've hardly heard from him. This morning for example after I texted first he exchanged 2 messages asking about how my work has been going, then ignored me for the last 13 hours. He's been actively posting on his business account, and I can see his online status on whatsapp now and then when I check, and I'm just so confused. I thought it went so well? Am I overthinking this?

Okay, so allow me to begin:
My friend is in a relationship with a girl, we’ll call her ‘A’. ‘A’ just so happens to know a mutual person, and this mutual person was flirting with her a bit. ‘A’ also has more than one IG account that don’t seem to be in use, but she does appear online on those accounts once in a while. ‘A’ didn’t stop the mutual from flirting whatsoever and allowed it to happen. I only have very few dry DMs, but who knows if they took place from other accounts that something way worse than what I have saved.

‘A’ also appears to be a sugar baby and my friend has no clue. ‘A’ still follows this account on twitter. And she’s not on it often but seems to also visit other folk’s islands on ACNH. One of them being 15yo and ‘A’ being 22F. Nothing wrong with ACNH, but she does speak to a lot of strangers through social media and online games without my buddy’s knowledge. And I don’t believe that the minor nor ‘A’ are related in anyway.

Is this cheating? Or some sort of weird emotional affair? The heck am I supposed to do?