The jealous third party
One tell I have started to notice over the years that shows that someone may be attracted to you is the jealous third party. You may be chatting to your person of interest, and suddenly, a third person, neither of you knows or is close to, joins the conversation.
That could be a sign that this third person is either interested in you or the person you are talking to, and wants to act as a buffer. Now, this is different from when it's a friend who just wants to join the conversation. That's just someone who wants to join in on the chat. The jealous third party is usually a stranger, or has no real reason to be part of the conversation. And they start doing things like cutting in or redirecting attention to themselves. They are not passive. They very deliberately try to stop your conversation and move the focus onto themselves. Sometimes, in ways that seem almost rude to just plain awkward.
Bonus points if this third person only comes to chat to you when you are chatting to this other specific person. They never come over at other times, but as soon as you and your person of interest start talking, or are about to start talking, they swoop in. I have often had difficulty reading signals and body language, but once I start noticing the third person, I go, "Oh, it's probably not all in my head. If this other person notices it, there may very well be something there." And that's a big thing. If someone else notices the chemistry between you, it must be tangible enough to be real.
Have any of you ever experienced this?