He (or is it a she?) may have lost his love for you. There is nothing unnatural about that and it is not a reflection about your value. It simply is the nature of love and reveals that the two of you were not a strong enough natural match to continue.
Love yourself enough to let go of him. The beautiful memories are a gift, but not a destiny. More to come as you get to know other people.
"Love" is a combination of the wholeness you feel and the neediness that you depend upon him to fulfill. It feels good to give to another and where we are needy, it feels good to get from the other.
The neediness is the unhealthy part of the relating and really is what changes in a couple. If he was with you for a particular need that he doesn't need anymore, then that's where you find yourself all of a sudden unneeded, unloved. What you need more than anything in your life is the ability to be content alone....no emotional neediness of anyone. In that way your gift of love is pure and never possessive.
When your love is pure of dependency, then your "emotions" change...they won't be emotions anymore. Depression is an emotion of the mind when the mind isn't getting what it wants. Infatuation is another emotion of getting what it wants. Happiness too. This rollercoaster is mental.
With pure love, there's a deep gratitude of being able to share unconditionally with another and a sadness when you have so much to share but no one to receive. You're still good with life, not dependent or depressed, just eager to share.
Totally different. When you're "love" contains mental dependencies, you're depressed when you don't get for yourself. When your love is pure, you're sad when you can't give of yourself.
This is an outstanding book if you can find it. Online Store - Intimacy: Trusting Oneself and the Other
Or search this library for free about love... Explore the Osho Online Library