Totally agree!

He is just an ordinary man who is not ready for a committed relationship but enjoys a casual relation. I don't see anything particular cold or cruel about him. He did not demand xxx or home cooking from 'the sister' and he did not feel like hanging around her all the time. The sister, however out of her own initiative, gave him care and love. If she was truly in love with him, the action of giving itself should be satisfying to her. The truth is that she wished him to return the same attention and love. Women play this type of passive-aggressive game all the time. Men are very aware of it and can turn cold and distant in fear of being trapped.