Husband is cheating

I have been with my partner for 15 years. We have 3 kids together, including two toddlers.

I have always thought we had a great relationship, but the last month we have been connecting amazing. I planned a rare date night and got a babysitter. All was good until we got home and I grabbed his phone to set an alarm for him for the morning.

I discovered he has been cheating on me with multiple people. When confronted he deleted the the one convo he knew I saw, but I I had seen them all.

We fought and talked for like 8 hours. Ultimately decided to seek therapy because of our kids.

The next day though, he showed me the messages showing me he ended things with the one girl he knew I saw. But I had secretely texted her to tell her that he was cheating with her.

She sent me her screen shots of their conversation and he had deleted and edited the version he showed me that morning. He didn't end things, he was leaving things open to pick back up with her once things blew over with me.

I learned that he pathologically has been lying to me.

I am so angry and I can't share this with anyone right now IRL. I'm too destroyed. I just need to hear support from someone that this garbage me destroyed my life.