Get help my dear. Professional counsellor can help you. It's not healthy for you to stay with this devil called Kelvin. For the sake of your Melissa, move out immediately and divorce him. He may do unimaginable things to your Melissa behind your back and she may be too afraid to tell anyone. And after divorcing him, stay single long enough to build a better life for both you and Melissa. It's time to Think with your head, not your heart my dear.