Take what I say here with a huge granule of salt. I have been through the same and also suffered with longing for many years before I realized that a partner or a person wasn't going to "rescue" me or give me meaning in my life, or really make me happy. I think people vasly overestimate romantic love and what it can do for you. The meaning comes from within. It is about developing a new relationship with yourself and as hokey as it sounds, learning to love yourself. What that means specifically is your conception, but working on the self and gaining self-worth, self-love, and self-confidence is imo the only antidote to this feeling. If one tries to ignore this important task, they are essentially trying to take a shortcut that will manifest itself problematically in whatever relationship they do end up in. Again, this is just my experience and opinion.