Do man hide out of fear to balance both relation and friendship or they can't get away with emotional affair and try to justify as friendship?

My boyfriend and I were about to get engaged when something shook our world. His female coworker, whom he introduced as a good friend, initially seemed kind when we met. However, two months ago, her boyfriend approached me, suspecting an emotional affair between them.

My boyfriend is a dream partner—caring, hardworking, and always trying to make things right. However, I was shocked to learn he had been omitting details about their interactions. They had lunch together daily, sometimes in a group but three to four times alone. They shared homemade food, and he even cooked for her twice—something he does only for loved ones. They watched thriller movies during office breaks, and their regular chats after work unsettled me.

Despite this, I found nothing suspicious or flirty. He mentioned me in their chats, often expressing how much he needed a good job to marry me. She even advised him on our fights and helped him secure a permanent position. Still, past fights over his female friends made him stop sharing details. While colleagues saw them as just friends, their boss and her boyfriend found them too close. Was he just scared to tell me, or was there an emotional affair?

On further note, what made me deal with this emotional breakdown is if the had any unintentional emotional affair going on as he never cared for any female friend like this (daily checkons, sharing everything, watching movies, missing when she doesn’t come office and he is paired with someone else). Well Their boss doubted as well but other coworkers felt its merely friendship. On the other hand I found nothing flirty and suspicious and him sharing about me and their supportive nature towards each others relations.

Do man hide out of fear to balance both relation and friendship or they can't get away with emotional affair and try to justify as friendship?
Post Opinion