Need advice

So please tell me am I crazy Like am I overreacting my husband works with this female who mind you is sleeping with a married man that works there as well and he has Attempted to cheat on me in the past and has been cause sexing before but not her However he does text her quite a bit and it makes me feel uncomfortable for the most part it’s about work but there is little Memes in there from time to time Like last night he sent her a meme of a lady’s nipples and a pregnant lady there has been a few other things in the past he says I’m Overreacting that she was standing close to him and he was just telling her to check out the memes He says I overreact too much and that I need to start trusting him and forgive him for his past I just feel like it’s a little inappropriate to send a female a meme of tits and a sexy pregnant lady with their belly out Am I crazy