uninvolved

adjective

not connected, associated, wrapped up in

Wiktionary

adj

Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English involved English uninvolved From un- + involved.

Not involved.
Emotionally distant.
Of potential mates, available because not in a committed relationship.