Our expert says:
I can't answer the main part of your question : you'd need to speak to a lawyer, and to an official from whatever cell-phone company is relevant. I suspect that you would not be allowed to get any information about anyone else's cell-phone records. That would be a breach of those people's personal privacy.
Probably more important though, is why you are allowing this to become so important to you, and allowing it to make you so miserable. And these are the topics you ought to be discussing with your therapist. Unless he has diagnosed Obsessive-Compulsive Disorder, and is treating you for OCD, I'm not sure how any drugs could help, and the psychotherapy would be the important treatment.
If these two have time to waste on hours of mere chat each day, they are either unemployed, or not doing their jobs properly. How do you know that they are doing this ? Is this just a suspicion, or are you also off work and watching your bf ? Haven't you discussed your concerns with him ? What does he say ? That you are so consumed by this suspicion suggests that even if he is not chatting to her, there must be something significantly wrong with your relationship, and needing attention.
Whatever is the basic problem, it's not really about cellphones or WhatsApp, but about an ailing relationship and a lack of trust, a sense of insecurity, and communication problems.
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