My 25-year-old boyfriend didn't mention that his previous crushes would be at the same event as us, and I'm 25 too.

Hello dear Community, I’d like to share a story that has been on my mind since last week, and I’m seeking your advice on how to proceed. This situation has been emotionally taxing for both me and my boyfriend, yet I can’t seem to shake it off. **Background:** My boyfriend (25) and I (25) began dating in mid-June 2024, officially coming together in July. Our relationship has been progressing nicely, and we've started planning our long-term future together. He introduced me to his parents in September 2024, and we moved in together that same month, while I kept my own apartment as well. This isn’t my first relationship, but it is for him. I experienced deep betrayal in a previous relationship when my ex suggested an open relationship due to the challenges of long-distance—even though we could have met a couple of times a week. I ultimately chose to end that relationship because I valued loyalty and emotional support. In this relationship, we’ve also discussed our desire for children and building a family, even starting to look for an apartment together to move in by September. Everything felt wonderful until December 2024. We attended a birthday party in another city hosted by a friend of his whom he met on a trip in September 2023. I didn’t think much of it when he mentioned another person with the same name, but upon arrival, I realized it was actually a girl. She approached us while we were sitting together and remarked, "You look so sad—are you bored?" I politely replied that I wasn’t, and though she left a moment later, I didn’t feel comfortable with her directness. Later, she returned, standing uncomfortably close to us and asking how we were doing. My boyfriend responded kindly, but afterward mentioned that it seemed odd for her to leave with another male guest later that evening. I shared my discomfort with him, and while he tried to reassure me, I was still unsettled. I later discovered they were following each other on Instagram, which struck me as odd considering he had only “seen” her a few times. I asked him to unfollow her, and he complied. Things seemed to settle until mid-January when I inquired about another girl he was following. He revealed that he had a crush on her during their trip and had even tried to pursue her despite her being in a relationship at the time. She also had been invited to the same party we attended, but couldn’t attend due to distance. Their history and continued connection made me uncomfortable, especially since he hadn’t mentioned her before. He assured me that he loved me and didn’t think it was relevant. I felt betrayed by the omission, especially considering the potential impact on our relationship had she attended the gathering. I managed to address some of these concerns with him, and he removed her from Instagram and deleted their chat history. However, I learned that he had also previously attempted to date the earlier girl I mentioned before but was brushed off. The fact that both ex-crushes were at the same party without him mentioning it to me feels heavy on my heart. Now, I find myself at my office, writing this message to sort through my thoughts and seek your insights. I want to move forward but fear that my past experiences might have left me vulnerable to similar emotional wounds. I would appreciate any advice or thoughts you might have.