The ex is also being uncomfortable, they don't know how to keep some behaviors in to themselves. I think they know how to love? But don't know how to be cooperative, and be open to eachother. They didn't had that much time to talk about their feelings, just love and hangout which it looks like the mc or you hated the serious talk because they lacked the experience or does not want to deal with those kind of situations. It is close enough to not know how to love, they just didn't know what to do