How can he be a good husband but a big cheater at the same time ?

I found out my husband has been cheating since before we got married, throughout our marriage, during my pregnancy, and even at the hospital while I was in labor. He was on dating apps, kink sites and apps talking sexually to multiple women, and going on dates. I found out when I was only 7 days postpartum. He admitted everything, begged for another chance, promised to change and explained how he’s an addict , and I stayed mostly because we have a baby together.

Yesterday I found out he started again only a 2 or 3 months later, the messages are nonstop sex, sex, sex with other women every day.

And what messes with my head is that he’s also a loving husband and a great father, he treats me well takes care of me , doing everything a good husband can do and our family looks happy from the outside. I can’t understand how someone can be both.

I’m currently 4 months postpartum, a SAHM, financially dependent and no family or friends nearby. I’m terrified of losing my baby, terrified of leaving, and terrified of staying. I feel completely broken and mostly confused and don’t know what to do. Please don’t judge me for choosing to stay when he did that first time. And if you ask how I didn’t know all that time until I gave birth, it’s because I never checked his phone never ever, until that night when I was up breastfeeding my baby, something in me told me to check the phone while he was sleeping next to me ( and honestly regret checking it at that time, especially at that time of my life), and yeah I found what I was looking for unfortunately.

Give me some advice please😞