Ya, that might be the anxiety. What can you do to control your anxiety?
If you are worried, perhaps call him to see when he's coming to see Boxer. Then, you'll have a fixed time and know what he's thinking.
I still think a date attempt is in order. The longer both of you stay apart, the less you will need each other for emotional needs. The less the connection, the harder to rebuild. That's my POV.
