I'm in the same phase right now - i know i want to move on but mentally and emotionally i'm just not ready. I'm not sure what you're past relationship was like, but mine was very restrictive in ways so i've found by doing things that i use to love to do before i met my partner and didnt do when i was with him is really helping me to appreciate being single! Also this is a great time to try out some new things and get to know who you are now - listening to different music, finding different ways to spend your time are all really great for moving on.

I know it might be hard now, but pushing yourself to mingle and get back out there is how you're going to know when you're ready to 'care' again.