May be just another verse from my at-times-shambolic, best case scenario song, but here goes:
Firstly, If the cat's missing I think that indicates DRC took the cat when or if he did drive west. An animal lover, as has been pointed out here, is not probably going to let the cat loose, or leave the animal to starve, etc., before running away, and a person who has been carjacked? his cat would be at his place of residence and be found by those checking there. So, to me, the missing cat is a plus.
Secondly, DRC attended the out-of-state wedding; family can be stressful enough in the first place, I think we might agree, but family in an unfamiliar setting may prove ultra-stressing, particularly if it's family we're not around much. And a wedding itself is not necessarily what we imagine it to be: a joyous and stress-free occasion whose impact on its guests is nothin' but delightful!
Thirdly, preparing to move in with one's significant other can be read two ways - the bright side is, yes, this may be strictly voluntary, nothing but free will here, and two like minds can be blessed by one another in closer proximity, one imagines. However, the decision itself is not free from stressful elements. One is surrendering a degree of freedom, no matter how one feels about the relationship.
It may be intuitive or it may be counter-intuitive to think it, but I think chances are that DRC left the state voluntarily. And I pray God this is so.