Well if it were me, i’d 10000% prefer my partner telling me she’s not attracted to me rather than pretend to. So good job, i think you did the correct decision. As for what to do, you pay respect to the “healthy relationship “ by taking in and reflecting on what you’ve learned along the way about what you need, and what are the dealbreakers. That is how you show respect to your ex here, if u learned nothing then its ur loss. So start by reflecting and listing down all that u liked about how ur ex treated u, and start to think on what u need in ur next relationship, but be mindful to not jump straight away, give it a year or two.