Because he had the actor's face, I'm guessing this is about a romantic fantasy, which can be a way of experiencing the masculine within you. Margaret is the part of you who perhaps has a double role - the part that wants to get back with your ex, but also the part who can encourage you to relate to the masculine within. You got close to your ex - you grabbed his hand and sat in his lap, and I would imagine this was reassuring. You probably have a real part of you inside who can play that role for you.