It takes a lot for me to start conversations with people, in person or online. Like I’m extremely nervous to do so. So if I talk to you and instigate the conversation it means I’m comfortable enough around you to talk. Especially if I end up talking a lot.
If I get awkward around you and am unable to create conversations I’m just not very comfortable, which isn’t a bad thing because over time I will become comfortable.
Unless I was already able to start conversations with you and then stop. It means I’m quite uncomfortable around you/nervous to talk to you.