I wonder about this. When several relationships ended, I may have missed company or intimacy, but besides the ending of my first marriage (and that took a while to accept and see clearly everything we weren't) other endings revealed pretty quickly, that it wasn't what I thought it was. It's not that I didn't grieve for the loss or that I wasn't frustrated, rather the grief was more productive. I didn't wallow (as much) in self-pity, I made changes, I stuck more to what I was looking for, and I waited. Oh, I was still lonely, and that sucked.