Your experience is a reminder that trust is something that should be earned, not given too quickly. I can understand why you became more careful after going through such a painful betrayal, especially when it came from someone you considered a close friend.

What I like most is that you didn't allow that experience to stop your life. Instead of going back to your ex, you chose to move forward, and I think that shows strength and self-respect. I believe we should be careful about who we trust, but at the same time, we shouldn't let the actions of a few people make us lose faith in everyone. Wishing you better friendships and genuine people around you.