He is just taking up space and preventing you from pursuing something or someone that is more solid and meaningful. Consider it a favor …
the Pisces/Virgo moon that I was dealing with basically said the same thing to me after an argument about a month ago.. he said he wanted to walk away from the situation. This was the second time he did that. The first time that he did it, I tried to fight for him and tried to change his mind.. and we did start talking again. But it’s self depreciating to fight for people who are fighting against us.
Like you said, it’s bittersweet but you gotta trust it. Wish him well and release him.. and have faith that something better is coming.