I have this good friend who is male. I allowed the friendship because he is aware that I am happily single and celibate and have no intention of pursuing a romantic relationship with him or anybody else, and he has acknowledged that and is dealing with it. He is not similarly geared, so I know that some day he will get a girlfriend and leave me behind. And so, every bit of time we spend together is precious because it is finite, and I know it brings us closer to an ending.
I find that, surprisingly, this does not poison our time together. I think this is the result of some combination a better understanding of the way God lets us intersect the paths of others and an understanding of the Japanese concept of finding beauty not just in things that are impermanent but in things that are fading right now before your very eyes.
My friend said once that he hoped we would be good enough friends that his future girlfriend would be jealous, and I found that touching but probably somewhat unrealistic. I don't do well with hostility, and it would take a very special woman not to be hostile in that situation. I wish that he finds that kind of woman for his sake.
Not that this will happen immediately. My friend is in school and working full time and his main hobby that might result in meeting new people is one that is not over-full with eligible young ladies. There are a few, but he does not wish to pursue relationships with them because he has had past relationships that started in shared hobbies and ended up in him having to drop the hobbies after a breakup.
The end is hardly looming right now, but it will come. I will enjoy the time we have until then.