Sharon Bush and her ex-fiancé, billionaire Gerald Tsai, who is suing her for the return of a $434,000 eleven-carat canary-diamond ring he gave her while they were engaged, met last week for a post-broken-engagement chat. "We had tea," she told the Daily News. "He was very upset. I was concerned about his welfare." To show her concern, Bush and her wonder lawyer (and publicity hound) Raoul Felder filed a response to Tsai's suit yesterday in Manhattan Supreme Court, in which Felder suggested that 78-year-old Tsai's "drinking could impair his memory and affect his credibility." We bet he feels better now!