(if this isn't the right sub and you know a better suited one, please let me know)

So I'm a very introverted person, to the point that I typically only have one real friend at a time. At the current moment that friend is a long distance online friend in a completely different time zone. We get along fine when we talk online, however, sometimes when I see them talking to others on other social media I get this weird spike of jealousy, like I'm afriad they're gonna like the other people better than me and stop talking to me. I know I'm being irrational because of how little interaction I have, but I can't make it stop. What are some ways to make me stop being so worried about this? (I know the real answer is "have more friends" but that's not likely to happen anytime soon)