I've had these experiences too. I've had a strong telepathic connection with my last 3 exs and those experiences were mutual and we talked about it. It's very real and can be overwhelming sometimes. If the other person isn't aware of what they are doing it can be hard to deal with, especially if you can't talk to them about it.
I was overwhelmed all weekend feeling strong energy coming from my ex, a certain event was going on and I know he was thinking about everything I told him about going to those things. Melody Marie picked up on all the things we were saying to each other telepathically and she knew it had started the night before I called her. A lot of times when I talk to her, she will tell me she was picking up on him a lot on a certain day, and it usually matches what I was feeling too. I feel bad about it because I think maybe the two of us disturb her sometimes with out telepathic arguments.