Cheating? Boyfriend secretly going out for coffee with his coworker

Don’t judge me. So i’ve been secretly suspicious of my boyfriend cheating with his coworker. His coworker is married and she just had a baby. I’ve never met her.

This morning he tells me there is no coffee so he’s gonna have to go out to get coffee from the coffee shop.

What he doesn’t know is that I checked his WhatsApp messages and I saw his coworker asking him out for coffee. Of course I played it cool like OK where are you going? Are you going to Starbucks? He throws out some random names of places he might go to.

He never states that he’s going to go out with his female coworker.

I suggest using some instant coffee that’s in the kitchen. He expresses that he thinks it taste like sugary dirt and FIRMLY states that he’s going to go out to get coffee.

Am I crazy? I think he’s emotionally cheating and it may or may not have been physical at some point.