My daughter aged 16 recently broke up with her boyfriend. I miss him so much that it makes me cry!?

I know this sounds ridiculous. My daughter broke up with her boyfriend because she wants to be singel for a while. I should be happy for her, but I find myself in tears every day, thinking about the boy. They had been going out for 2 years, and he used to spend every weekend at my house. I didn't realize how much I was attached to him. He was like a son to me and I loved him dearly, as he was very sweet and helpful, always playing with the younger children and making conversation. I feel I have lost him forever. I wish I could tell my daughter to take him back, which is wrong of course as I have to respect her decision. I never thought I would feel this way, grieving over my daughter's breakup. I am happily married by the way and my affection for the boy is pure motherly love. Do you think there is something wrong with me and what should I do to cope with the situation? I feel very sad and disappointment, as I thought that they would always be together...