I suspect that the chance of being stopped is reasonably low but the top-level guidance says:"Travel to or from Scotland without a reasonable excuse is prohibited by law. See
exceptions for which travel is permitted, but please avoid travel for even those reasons unless it is essential."
In the exceptions for which travel is permitted, reuniting with one's other half (desirable though that of course may be) doesn't seem to be on that list of exceptions. If the OP's other half could determine that the OP's home is also her home, then she might be able to say she's returning home, but the OP says she is a US resident.
Others might have different views of course!