Not sure why you think people would treat you harshly for being in a relationship, if you’re over your ex. Congrats if you found someone you like! The lines that most gives me pause are where you say you two haven’t changed much and “ But we were young, and although we had a great time together, we were typical of any couple in their mid-20s -- worked hard, played hard, and broke up twice.” I broke up with people for real reasons. I’d face why you actually broke up twice, and consider what has changed if anything due to the intervening years (meaningful stuff-/not stronger feelings, wanting it more, etc.) to maximize the chance of a different outcome or abort early if the same outcome is likely. Good luck!
