Yes, twice. Boyfriend 1 and I have no contact now, and I believe it is because the person who came between us, his domme, would be displeased with him if we did. I wrote to him a few times over the past few years and tried calling once and he never responded. We were together over two years and we had considered each other best friends. The domme had been up front with him about wanting him to get rid of me, and he wouldn't, so she resorted to manipulation and deceit and phony emails purporting to be from people we knew, etc. I hear that she wanted to get rid of a more recent partner of his because she didn't like the long-distance nature of it, and succeeded there too. I don't consider that boyfriend a great loss now, even though I loved him, because he is clearly her puppet. I see him sometimes across the room at events and he looks really unhappy.
I did try to reinstate the relationship with Boyfriend 2 about a year after we broke up. His wife had come between us because she was jealous and not owning it, after he and I had been together about a year. In the process of an attempted reconciliation, he revealed that he was more than a bit mentally unhinged and irrational, just like his wife, not to mention petty, resentful, hanging onto anger for minor things that had happened a long time ago. He actually told me that a more recent romantic partner of his, who by his own admission to me was avoiding having sex with him most of the time because she was "tired," was superior to me BECAUSE I had had sex with him pretty much whenever he wanted it. Apparently he equated withholding sex with virtue. Or something like that. His wife hadn't wanted to sleep with him much either, so I guess he was used to it. It was all just too loony and I did a quick 360 from wanting to reconcile with him to wanting nothing to do with him.
After these two experiences, I have learned that if a partner lets a third party come between us, he isn't worth hanging onto, and I should be the one leaving the relationship with skid marks. My current boyfriend's wife seems very supportive, but if she ever ceases to be so and he looks like he might give in to her, I will be outta there.