I don't think either of you is right or wrong.
I think he just isn't super-attracted to you (as a friend or date) but you are to him which is why you're feeling quite intensely about things.
I think he genuinely is quite "neutral" towards you..maybe he sees you as a group mate or someone who has been enjoyable to chat to or text, but not someone he wants to prioritise. He's probably not thinking that much about you.
(I mean us Mumsnetters share very personal chatty conversations - I don't think any of us want another Mumsnetter then insisting we meet!)
Also, if you're starting conversations about "whether or not you've done something to offend him" it does come across as a bit pushy and intense?
I was a slow social starter for a few reasons, and I used to take things fairly literally.
But often people make light chat, have good one-off conversations but don't really want to follow up?
Like I've had a couple of good work interactions, maybe had some enjoyable light social chat. Nice to be nice.
But I genuinely walk out that day and wouldn't care if I never saw that person again.
But then the men (it's ALWAYS men, so I assume its a pseudo romantic thing) start thinking as we've had those brief conversations I am now THEIR PERSON and they want to escalate things.
And I make excuses as I don't want to say "look, I don't really actually want to make 1-1 time for you as I think you're going to take things too seriously
Or they come up with spurious "suggestions for joint hobbies" or "ask for random advice" just to force an interaction and its a bit OTT. Especially as I'm not attracted to them so don't want them getting the wrong idea or gossip starting.
I agree he could be a bit more mindful about not giving you false hope, but maybe he doesn't know how "super-keen" you are so just sees you as a chat buddy?