co: it doesn't apply to this case
because her assumption is that both party want a relationship but afraid of being hurt. in this case, he never wanted to have a relationship at all but likes the attention and warmth another person can give. so he's just doing what's convenient for him and she's not really any of his concern. I'm happy Jiejie left him because although he might not be a bad person, he's very capable of hurting other people at their own expense.