He feels that he is "missing out" by being in a committed relationship.

I have had a wonderful, supportive, joy-filled relationship with my partner for the past 5 years. We also have a gorgeous three year old daughter. My partner has recently said that though he believes I am the love of his life, he feels that he is "missing out" by being in a committed relationship. He had only ever had casual relationships before we met and he wants to travel, concentrate on building his career as a singer/songwriter and possibly explore other relationships. I am absolutely distraught. He and I both feel that our relationship is nurturing, respectful and a source of joy but he seems determined to explore the "what if". I am afraid that he is making a terrible mistake (although I do understand what he wants) We now have a family and a home and if he wants to go overseas etc I would prefer him to do it when our daughter is older and we can go together or as a family. If he leaves me I know that I will never be able to take him back and I TRULY believe that he will want to return to me and our child. He is a good man and I love him so very much. I want him to be happy but I am so very scared.