Would you tell his wife?

So I recently reconnected with a former male co worker of mine. He reached out to me and we were just having friendly, platonic conversation about work and life until he mentions out of the blue that he actually likes me and has always wanted to get with me but says I never paid him any attention. I met him before he got married but never was interested back then and of course I'm not interested now.

He's being very inappropriate with me. Every day now he's messaging me asking to see me, asking me for pictures and making sexual comments about my body. I told him I'm not interested in being with a married man and will block him. I actually know his wife because all three of us worked for the same company at one time. His wife and I still work at the same place but he works somewhere else now. I see his wife sometimes and we are friendly when we see eachother. I really thought he was a decent guy and I'm disappointed that he turned out to be no good. I'm really shocked and disgusted at his behavior. I'm sure he's a serial cheater by just the way he’s going about things. She probably knows all about him. I just feel uncomfortable around her now knowing the inappropriate way he's behaving with me.

Would you say anything to the wife or just block him and keep it moving?