I'm the opposite way round, i find it a lot easier to be with someone who is high-functioning/stable. This is partly that I don't like conflict and I do like transparency (people who are secure in themselves are more likely to communicate well), and also I like being around people who have a positive outlook and experience a lot more positive emotions than I do. I can learn from them and also just being around happy people makes me happier. My closest friends are all stable and secure, although I have friends who aren't, and I find being around people with MH issues makes me worse.