My boyfriend wants out of our open relationship and I feel betrayed?

So, my boyfriend and I have been together for six years—five of those in an open relationship. He was the one who first suggested we open things up. At first, I wasn’t comfortable with the idea, but eventually, I became more open to it. We had a “no tell” rule—meaning if either of us hooked up with someone, whether once or multiple times, we wouldn’t share the details.

Lately, I’ve noticed he’s been acting different—distant, not as attentive. So I decided to sit down and talk with him. After some hesitation, he opened up and told me he’s no longer in love with me. He said he’s in love with another woman he’s been seeing, and he wants to settle down and start a family with her. Hearing that shattered me. I’ve always wanted to start a family of my own—and I always pictured that being with him.

I told him how hurt I was, that I truly wanted to be with him forever and build a life together. But he just looked at me and said I wasn’t “the one,” and that she is—she’s the person he’s been searching for all along.

I feel so stupid and heartbroken for letting this man string me along for so long. I don’t understand—why would he do that?
My boyfriend wants out of our open relationship and I feel betrayed?
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