Do you think my ex liked his coworker?

So my boyfriend has been close with one of his coworkers. We broke up a few months ago. He added her on Facebook a month after we started dating. He was around her all the time and avoiding being around her around me. He basically made her a priority over me. I stumbled across his Facebook and I noticed they are no longer friends on Facebook (he doesn’t have many friends).
Do you think my ex liked his coworker?
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