Cheating and lying husband.

This is going to be really long so I'm sorry. I dated my husband since 16 he's 9 years older then me. He cheated on me while we dated and did some pretty bad things. I forgave him but when I was 19 we called it off. We got back together after about a year in a half. He had changed was going to church we are LDS. We got married when I was 21 and have been for five years. I'm going to try and keep this short. He got sick and was in a wheelchaire for some time. So I've had to work and we had a baby girl who is almost going to be five. But since he couldn't work we had to live in my mom's basement. He has a sex and porn addiction that I have tried to help him with. While living at my mom's house he did look at porn and lie a lot about it. He would expose himself to my mom pretending he was unaware it was out. Fast forward two years when my daughter was two we moved in with his family. He created a fake Facebook account and contacted random girls but also my sister and a friend of mine. He sent the random girls pictures of his penis. Not my sister but did sext her. I decided to separate from him. But told him I wanted to fix it. He had to take his fake profile down and never get on it. He ends up cheating on me with a girl they didn't have sex just oral and tried anal. I also tested him which I know is wrong but I did it. And I had a friend text and flirt with him and he took the bate and texted her and sent pictures and asked for pictures back. And asked to even meet up. And all this time he had till gotten on his fake profile messaging girls. So I of course forgive him and tell him this is his last chance. He actually stopped. For a year everything was great. We just had a son in August and got our first house. He messes up again. He went by my mom's to pick up sometimes and exposes himself. He admits to me he has been looking at porn and on his way home he would exit and drive up a canyon to masturbate to it. He also went on Craigslist to message someone and sends pictures. I tell him I'm done if you lie or mess up again. So it's been three months since then. I go in our bedroom and he hurrys to put his phone down. I ask him what he's doing and he lies and I so no really. He lies one more time. And I'm like no what were you doing. He finally admits it. Now fast forward a couple days I'm visiting my mom and she says look at this funny text I got. It was sexual at all but I knew it was my husband messing with her. I confronted him and it took him a bit to admit but said he text my mom and my friend. Says it was only a joke. He used an app that will let you have multiple numbers. So now I feel like I'm at my wit's end and that he is never going to stop. It's obvious I love him or I would have left a long time ago. And I get so mad at myself cause I think k other women would have left long ago so why cant. And I feel so heartbroken cause all the chances and forgivenes I have give him seems like he doesn't care at all. We now have two kids together too and just moved into our first home. I just don't know what to do? Of course I'm thinking divorce but I don't know if I can . Or I think he has been trying hard to change. I should expect some mistakes along the way? I don't know. Help!?