I don’t think you ever stop loving “the first” or any of the following, for that matter. But the love we have for those people is transformed as we grow further apart from them due to pain, physical distance, or whatever else. Once you love someone, you will always love him or her. The only difference is whether or not you’re /in love/ with that person because falling out of love is a definite possibility. That’s what can change – the state of being in love.