What steps should I take?

I (25F) and my boyfriend (34M) have been together for nearly two years. To give you some background on our relationship: we met in 2021 and initially became close friends, which eventually led to a friends-with-benefits situation. I fell in love with him, but he didn’t feel the same way at first — he had a bit of a player reputation before we started dating. Before we became an official couple, he went overseas for a job on a ship. A few weeks after he left, I found out I was pregnant, which caused him to panic because he wasn't ready for fatherhood. He urged me to see a doctor to confirm the pregnancy, and later that day, he called to say he was considering a relationship with me and would formally ask when he returned home. However, during the three months he was at sea, he was talking to other girls while I remained completely loyal to him. During this time, I also suffered a miscarriage, which was incredibly difficult for me. When he returned home, he wouldn’t give me a clear answer about wanting to date, and it took me expressing that I could no longer wait for him to realize he might lose me. Once we officially started dating, things seemed to be going well until I had a gut feeling to check his old phone (I know snooping is wrong). What I found shattered me: evidence of the women he had been talking to and explicit pictures he received while I was confiding in him about my loss. We talked things through, but my trust was shaken, especially after discovering notes on his phone listing the pros and cons of dating me. Fast forward a month, we were lounging on the couch together. He was moving between his phone and YouTube videos. When I stepped out to use the bathroom, I noticed he quickly locked his phone. I became suspicious but tried to remain calm. When I returned, I caught a glimpse of him on Reddit looking at explicit content. I confronted him, and while he tried to dismiss it, he knew I saw everything. I was upset because, given my past experiences with my ex, I have strong feelings against pornography. He apologized, but it felt empty since he already knew how I felt. Throughout our relationship, we've faced ups and downs, but the main issue has been me repeatedly catching him looking at porn or naked women online. The last incident was particularly hurtful: we had an intimate morning, went shopping, and when I opened the car door to get in, he was looking at explicit content. I was devastated, and while he apologized over and over again, it felt like he was only regretful about being caught. After expressing how his actions made me feel disrespected, he seemed to understand and hasn’t repeated the behavior since. Recently, I discovered troubling information. Before his last trip, he used my dad's backup phone while waiting for his phone to be repaired. He left everything logged in for me to see, and while browsing his emails, I noticed one that stood out. It was from a girl who helped him renew his driver’s license; she emailed him, saying "I thought you looked cute." He responded casually and ultimately gave her his number. I recently saw their conversation where she expressed her interest in him, and he flirted back, even saying, "I could say the same about you." They discussed whether he was married, which made it seem like he was trying to appear single despite having a profile picture of us together on WhatsApp. Reddit, I’m at a loss for what to do. I genuinely love this guy; he’s done so much for me, from caring for me to helping me out of a deep depression when we first met. In my past relationships, I always felt like I was the one giving. Any advice would be greatly appreciated.