Possible Clues:

• Jeff's partner isn't finished losing the head with twin and it's reciprocal
• Reciprocated, as a feeling
• Shared by two or more parties
• Common umlaut design
• Common word in insurance company names
• Fall in the US not entirely reversed, fifty shared
• Jeff's partner doesn't finish university in American city? Turns up, it's a common scenario!
• Affecting both parties
• Given and returned, coming back in fall, autumn
• -- funds