I want to take my child away due to my wife’s betrayal

She said they had just gone out to a restaurant, drank coffee and had a chat. No boundaries were crossed. My wife apologized and said that she wanted to stay with me to take care of our child together.

She promised she would cease all contact with that colleague. Our child is only two, so I decided to forgive her.

Recently, I’ve found out that she still continues messaging her coworker, although I can’t figure out the content of their messages.

I confronted her and she insisted that their messages are all work-related, and that they only see each other as colleagues now. I don’t know if I’m being too stupid to continue trusting my wife’s words.

I want to take my child and leave this marriage, but I’m currently working shifts, so I cannot take care of my child alone. I’m feeling extremely frustrated right now and really don’t know what to do.