No, not really. Thank you for this.
Question for anyone else who has been through this: Have you ever pumped yourself up all day to have "the talk" and then you get home and everything is so...*normal* and he's so good to you that you can't get the words out of your mouth?
All the time! And you hate to hurt them. But it's gotta happen, you're protecting yourself, not inflicting hurt on them. They did it to themselves, remember? It's definitely hard when they still seem like such a good person.
Just remember, actions speak louder than words. You know what's going on. You don't need to wait for it to be flung in your face. He might gaslight the hell out of you, try to make you feel like you're crazy. You know what? That's not the sign of someone who cares about you.
There's no kids to worry about here. There's nothing to tether you here other than the fact that you had fun with him at times. But you don't deserve this (and btw, SCREW Whatsapp with a dirty spoon -- is it specifically MARKETED to cheaters?). So get that lawyer, file the papers, you've got time to think, the balls in your court. Don't let him convince you nothings wrong.
Something is VERY wrong.
And in my opinion, yes, he's slept with her, or others. Sexting is not like porn, it's a prelude, not a substitute. I would be willing to bet (and speaking from my own experiences) that it has been physical at least a handful of times already.
Nice guys can be d*ckbags too! But you already know that I think.