To long for another is to simply sit with a space in which their presence accentuates existence. Where their energy adds only to the better elevation of one’s soul. Where they sit afar, having been bestowed the key that allows us to feel all those big and beautiful things for ourselves. Given emotion or feeling as a choice, one can extrapolate that all that is felt is our decision, and that there is zero to do with being ‘made’ to feel a certain way. We are only provided with the opportunities to feel in any way. So, when one finds a pattern of choosing to feel better around specific people. It is then rather comforting to know that all of the happiness, joy, and love, and so on is merely our inner-self-expression being allowed to flourish in an external circumstance. It is always there, always possible, we have simply placed it upon another.
Meditate.