What does it mean when my LDR partner doesn't talk to me much?

Time to have what we call in the business world a "come to Jesus" meeting. That is, have a conversation and get back on the same page.

PS this is likely a prelude to ending things. If it is, then your partner will have the opportunity to get it over with. If not, then it's an opportunity to rekindle your relationship.

LDR--???????????

Libidinous Dog Restrainer
Lecturer on Dietary Restrictions?
Legal Drag Racer?

long distance relationship

oh, thank you.
I suppose I should just keep an urban dictionary by me side

Gneiss one, it's Lithostratigraphical Deposition Rate.

In the interim, the original poster appears to be between a rock and a hard place.

It will all come out in the wash.