He THINKS that being apart will solve his "problems" or make him happy. He admits he is confused. He admits that he doesn't like the idea of you being with someone else. He wants you to be happy.
The conversation had its own uniqueness for your sitch, but the general theme is similar to any other LBS of an MLCer.
It ain't over and this one backslide is not going to seal the deal.
Take what ever time you need to work through your emotions and then get back up on that horse and keep moving forward.
