Prove the relationship?... It's doomed to break
When you had been asked to prove your relationship with your partner who can be either friend or fiancee or even spouse, whom you are absolutely comfortable / crazy with? What was your reaction such demand? I can surely claim that such demand must have validated the widening gap instead of cementing the relationship. Ofcourse we feel hurt by the people who matters us the most rather than some non committal relationships. But demanding the proof of the relationship is something extreme and even breaking point in many relationships, no matter how much intense the love is.