I am exhausted but I cannot share this "secret" or can I?

I don’t know what to do. I had started a special relationship with this person and we both liked each other. However, this relationship has gone sour and I have become unimportant to this person. I am so sad that I want to share my feelings and sadness to others, get comforted. However, this person told me our relationship is a secret and I cannot share with others. Although this person thinks it is a secret, not for me because I am ok to let others know about our relationship. Now I am so sad, trapped and hurt, what should I do now? Is it right for me to let go my emotions and my feelings without mentioning who this person is? Shall I continue to keep this to myself and bottle it up?