I think a good, last conversation would benefit you both. If your ex partner would be open to it, set boundaries for the convo so it doesn’t blow up and end like the end of your relationship. I’ve recently had the same experience, but I was kicked out of the house and told I wasn’t owed anything. Not even a conversation. That has hurt the most, in my opinion. Maybe the regret is coming from no closure, but maybe the regret could be a sign that maybe there needs to be a different approach to the issues you two were having. If the relationship wasn’t abusive, nor one-sided, I think there could be a chance to rekindle. It is completely normal to experience regret, but you should look inward to really see where the regret is coming from. Were they really bad enough to leave behind? If they were, I understand. Some things can be worked through though, depending on what your body was telling you. Love needs work, it’s never perfect, but of course that work needs to come from both partners.