Waybread pretty much said it all, and very well.
He just changed signs, so he is off on a new path.
He isn't with anyone else, but what difference does that make? He isn't with you.
Moon is in the 12th for a reason, as you suspect.
You, Jupiter, just received a square from mars, ruling both self esteem 2nd and thoughts 9th.
Still retrograde, mulling over past events, when you turn direct you will aspect Neptune by sextile, which would be enlightenment, bringing you back to yourself, to your inner core.
And you will proceed to conjunct Pluto, co-ruler of the 9th house which is already energised by the mars square. This will confront you with control issues.
Consider your statement, "I told him when the time is right, we can finally sit and talk about it.", puts you in the driver's seat, but in reality you are not there, he is, by the very fact that he simply moves on.
No, sorry, you are not in his chart. He in Leo is taking care of himself.
You in Capricorn have a very different path to follow.
Keep him as a friend. You are in the 11th, and he is in his 11th, and this can be a value for both of you.