OK then yeah the above is possible, unfortunately.

When you don't contain your emotions and "stream of consciousness" around others who you don't have a long-term established, equal and reciprocal, close relationship with, then it can result in all kinds of issues, result in more emotional reactions from those people where those emotions will make them take more action and then it can all get out of hand like this and tarnish your reputation even in the eyes of people who previously liked you. Or they may still like you but get uncomfortable with not being sure how to maintain a relationship with you without it getting even more out of hand.

And if that's what happened here, then your GM didn't actually walk out on you willfully. Like others already said in this thread, he just does not want to get the whole relationship with you get more out of hand, hence the distancing. And sure, it would be great for him to communicate with you about it, but it can be very hard for people to do the optimal communication about emotionally sensitive issues.

I really hope you can learn from this case about where not to become too open and display all your emotions and thoughts on the spot, but be selective instead about where you share yourself, and I hope that you'll be able to move on okay.