First of all, congratulations on making it through so much and still having a good job and what sounds like a solid relationship. I can see how it would be nice to have more people in your life, including supportive long term friends and family. It can be difficult to figure out what's going on in other people's relationships. As general advice, I would try not to mention things that could make someone else jealous unless they directly ask about it.

If someone's full of bad energy, sometimes a break is what's needed. Keep in mind when you can or can't steer a discussion in a better direction from where the other person is taking it. If they are getting negative, try to redirect to something more positive.

Remember to give old friends the benefit of the doubt whenever possible. Sometimes people are unaware about when they are acting out in jealousy, etc. Listen carefully. Figure out what their issue truly is and address it. Seek to understand the other person's perspective no matter how different it is from your own, and for them to understand you.

If time permits, put yourself in a position to meet new people and see them on a regular basis. It's nice to have a mixture of old and new friends.

Good luck!