My husband (30M) and I (32F) have recently opened our marriage. We have both agreed to no romantic attachments and have been pursuing a FWB type partnership with others. We have agreed to only see those once per week. We have access to each other's phones just for transparency sake and I was looking through texts and it appears there may have been a phone sex type situation on a phone call with his FWB. I don't quite know how to feel because he has already seen her once this week and engaged in sex. We don't have a specific boundary but he is aware that sexting is something that bothers me. Is this something I'm just being unreasonable about because it does bother me. I just need someone to help me out.