The clutch hydraulics might be out of fluid and not returning the clutch pedal. Yes, there is usually a return spring on the clutch pedal but this is sometimes an over center spring that assists in pressing the pedal once you get past 1/2 way.

Regardless of the actual problem, I'd pull the trans and replace the clutch assembly , clutch slave - master and be done with it, who knows what the clutch friction material condition is.

In any event, hold out for a title, flaky sellers ( " lost title ", " no money " , " bought from my uncle " ) tend to disappear once $ changes hands despite their promises to follow through.