Initials instead of names?

Kaity
So my husband had cheated before, with a girl who's initials for her nickname is BL. That was nearly 3 years ago. 
Today, while I was getting ready for my dads burial, his phone went off like 10 times in a row, and it was in the bathroom with me. I told him his phone was going off, and he asked me to look and see who it was. 
And it was someone who he has in his phone as BL. When I yelled out that it was BL, he quickly came in the room and took his phone. 
I told him it was super sketchy that he had someone in his phone by initials only, and he said its this guy from high school named Brian, and growing up, they called him B. I said its still super sketchy, especially given his infidelity with a woman who's initials match.
Am I over reacting?