Credit: SWNS Kathy Nickersonbr br A relationship expert revealed four signs a relationship is going to last – and says it’s OK if couples argue as long as they "fight fair". br br Clinical psychologist Dr. Kathy Nickerson said there are four very simple things that indicate a relationship is a strong one which will go the distance. br br Dr Kathy - who has 22 years of experience in the field - says "it doesn’t matter if you fight sometimes - as long as you fight fair." br br Indicators a relationship is strong including it "feeling easy", genuinely caring about your partner’s happiness, and being “intentionally gentle and kind” to one another.