Porn Problem

I caught my husband of 5 years searching up porn. To be specific, he searched up “sharing” “husband shares wife”. I had a feeling something was up with him but I just never was able to catch him since he was using the private browser on his phone. Today I caught him! He forgot to close it down. When I asked him about it he said he was watching porn during work hours (He works at a company, not from home) & had to “get one out” to “let out some stress”. AT WORK?! Am I overreacting here?!