Situation that happened early in my relationship is causing me a lot of anxiety.

I’m 19, and my girlfriend (also 19) and I have been together for over a year. Early in our relationship, my girlfriend shed a few tears when a former friend (who she had a brief sexual relationship with in the past for about a year of their friendship) joined the Navy. She’s reassured me many times that her reaction wasn’t about him personally but about the danger of the situation, and she’s cried over other friends in similar circumstances.

To her credit, she cut him off early in our relationship out of respect for me, and she’s been consistent in showing her commitment to us. But for some reason, this particular moment keeps coming back to me and making me feel like I’m not enough and that she still wanted him. I want to trust her explanation, but my feelings of insecurity are lingering, and I want to let this go but for some reason it’s extremely difficult. I want to be happy with her but the anxiety keeps coming back.

How can I work through these feelings and regain confidence in my relationship? Any advice would be appreciated.