A couple years ago I had a few psychics tell me that I was feeling certain things because my ex couldn't stop thinking about me. I'm an empath myself so I do know it's possible for me to pick up other people's feelings and there have been times where I could validate it was right..but never with him. In his case, it would happen off and on for months, complete with intense dreams, and I never got any validation of it being true. We never reconciled and he never made any decisive moves to try to get me back. I even opened the door a few times and he didn't really do much.
My experience is that when it's someone else's feelings it can be very intense but isn't accompanied by a specific desire for an outcome for me. Like I might feel anxious because my friend is worried about a job interview, but it doesn't turn into to me desperately wanting her to call. I just feel the generalized anxious feeling. Whereas if I strongly feel this anxiety wanting X to text me, I get very suspicious it's something other than him causing it. Maybe it's mercury retrograde, maybe it's the Spring Equinox, maybe the moon is farting on Jupiter, but if he wanted to be in contact with me, in my experience I wouldn't be feeling it as anxiety about him.
Some of the readers even told me I should think MORE about him with LOA type stuff to get him to come back. I'll let you guess how well that worked
I would say be cautious of it. It's exactly what we want to hear: a decisive reason why we feel the way we do that doesn't require us to move forward, complete with an explanation that includes the person still having feelings for us! I've come to look at it like this: feelings are one thing but actions are what matter. The next time it happens I'd take charge in your mind and tell him to keep his anxiety to himself unless he's prepared to step up to the plate ;-) Bonus: if he is feeling you, he will miss you when he senses your energy pulling away.