Someone has done something you don't like. So now you treat them differently than you did before. And you have a negative mindset or attitude towards them. What you are doing is holding a grudge. Bitterness has crept into your heart. And, friend, that's not a good thing. Not at all.
When you hold a grudge.....
You are only hurting yourself. Do you think the grudge you are holding is punishing the other person or teaching them a lesson? Guess what? It's not. The person you're punishing is yourself.
You are letting the past control your present and future. Life is about moving forward. But your grudge will keep you looking backward. And you can't make progress in your life when you're holding on to whatever is behind you.
You are acting nothing like Jesus. He forgives your failures. He hangs in there with you when you do wrong. Your holding on to a grudge towards someone is the exact opposite of how Jesus acts towards you.
Trust me when I tell you, holding onto a grudge is not the way to go. Nothing good will come of it. But forgiveness is far better! It frees you up to live your life, fixes broken relationships, and helps you treat people the way you want to be treated. Remember that forgiveness has been shown to you, so the best thing you can do is show it to others. That's when you're really reflecting the character of Jesus, which is a mighty good thing!