Ask about them. People really don't want to know what you are doing. If they ask they are usually just being polite.
You can't get someone back by being annoying. That is likely why they left in the first place.
So... I don't really understand the question. But it sounds like you have been told you are talking about annoying stuff. So just try not to be the talker and be the listener. People like to be listened to. Everyone does.
Also read the book "How to win friends and influence people" by Dale Carnegie. If you can't afford it I guarantee all libraries will have it. It's a famous book written many years ago.