How to work through things and trust again.?

Last year, at this time, I found out my husband had become a different man. He was extremely religious when we first got married and remained that way for 7+ years. I caught him on porn last summer, which was extremely shocking and out of character for him. I ultimately forgave him, and he repented and to my knowledge has not participated in the porn for a year. In Oct., I found out that he was planning to file for divorce behind my back, and was also up to some shady business that he knew I wouldn't agree with. We have spent a year rekindling our marriage and working hard to eliminate those issues. I still have a hard time trusting him, and also a huge fear of him leaving. He says that's not ever going to happen, but how do I trust him, when he's been so untrustworthy. I do not hold his shortcomings against him, I have forgiven him, just find it very hard to trust. Also, I am pregnant with our second child, which with the hormones going all the time, seems to make the fear so much larger. Any ideas?