Significant other trouble and advice please..

My fiancé and I have been together for 2 years and engaged for nearly one year. A little more than 7 months ago we found out we were expecting our first child. Although we were incredibly nervous, we were also overwhelmed with excitement. The only problem is, my SO is a very good, yet terrible liar. Meaning his lies are so terrible it becomes believable. Crazy, I know. It is affecting the trust within our relationship. One night I had this horrible gut feeling that something was going on behind my back, so I began to snoop through his phone. No strange texts, calls, etc. but when I pulled up the Internet browser, a porn website emerged. "Typical man" was my first thought. It hurt my feelings so bad, but I tried to brush it off. Then I noticed he also had 3 other tabs open. Opened those and discovered he had created a profile on Adult Friend Finder. Everything in his profile was completely false, as you can imagine. Then, I was devastated. Here I am engaged to this man, 7+ months pregnant with our first child and he's on a nasty website - profile and all. Please help. I hate to say it, but I depend on him so much right now financially. I have a job, but it's part time because I am still taking college courses. I do love him, but I have a little doubt with our relationship and how it could ever be okay again. Basically, what should I do?  I confronted him as calm as I could. He seemed to realize the damage he had done and claims to love me more than life itself. I could never say that caring and loving someone would also include keeping secrets like this. That's not care and love. Any advice would be greatly appreciated.