How do I stop obsessing over my boyfriend’s ex and his past relationships?

My boyfriend and I have been together for two years. I love him deeply, and I know he loves me too. However, throughout our entire relationship, there is one thing I just haven’t been able to push out of my mind: his "ex-girlfriend."During our time together, I went through his phone a lot. I learned many things I probably shouldn’t have known, to the point where the topic of his ex has now become a massive trigger for me something I feel I might even need therapy to move past. But there was one specific thing I found out during those phone snooping sessions. I realized that after my boyfriend broke up with a different girlfriend in his past, he went right back to this particular "main ex." This discovery triggered a flood of thoughts in my head. I started thinking, "Wow, he loved her so much that he would probably leave me for her too."Eventually, without admitting that I had gone through his phone, I brought up the situation. It turned into a huge argument between us. He was defensive, saying things like, "What are you trying to imply? You are insulting me. Just because I had a past doesn't mean I'm going to leave you. I lived through some things, and it’s over." I didn't push it any further because I didn't want to keep fighting, but it still affects me deeply. He is someone who shows his love for me a lot, but I just don't know. The fact that he loved another girl that much causes me to overthink constantly, and I can't seem to stop.

How do I stop obsessing over my boyfriend’s ex and his past relationships?
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