Looking for a trust building/relationship help app

Okay, so me and my SO are recently engaged. And I'm so excited! However.. we are still working through some issues. A lot of it trust.. I do trust him for the most part but I still have lingering issues. Earlier in the relationship he would keep his phone really locked up and had a porn addiction to where it would really affect our sex life. He's talked to other girls "innocently" but they would try to be sexual or flirtatious. I finally broke down and told him I couldn't do all that anymore and I would he done if he didn't stop. It's been about 4 months since he has genuinely made an effort. And things have been a lot better. He promised to stop watching porn and minus one (to my knowledge) slip up he's been good. Porn in a relationship doesn't bother me, really. Except this one because it's so negatively affected our relationship. He doesn't have passwords on his phone and things in general have been awesome. But I still catch myself not fully trusting that he has stopped. We currently have a baby on the way and with the engagement and baby I've really come to where I'm so afraid that he's going to slip back into the man he once was. He still has a huge temper and when I'm trying to talk to him and we start getting into it, it gets ugly. He will tell me to shut the fuck up and leave him alone etc. After a while eventually he cools off and apologizes. But we can't fight like that and have these issues in our relationship with starting a family and progressing towards marriage. It obviously isn't like this always, since we are engaged. Mostly the issues are back of the mind attacks. But his temper has been there more lately with money stress.

So with all this venting lol what has helped your relationship? And have you found any apps that have helped? Religious or not, I'd appreciate it. Where we are at isn't exactly healthy and he's suggested counseling. Trying to work on us unless we require professional help.