He behaves differently with his ex and his current partner. With his ex, he's friendly and amicable, keeping the conversation going and staying in contact. With his current partner, he's cold and emotionally distant, often ignoring them or being short in his responses. With his ex, he's friendly and open, sharing details of his personal life and asking about theirs. With his current partner, he's indifferent and detached, not showing interest or effort in maintaining communication.