"I've started having obsessive thoughts about my boyfriend's previous relationship. How can I overcome this?

I am going through a period where I feel incredibly mentally sensitive. I find myself constantly crying over this issue; my tears just won't stop. I love my boyfriend deeply. He is my first love, but I am not his. Honestly, that fact alone isn't the real problem. The problem lies with his previous relationship—a relationship that started in high school and lasted almost five years, where he even forgave things that he probably shouldn't have. I constantly find myself constructing scenarios in my mind, convinced that he hasn't forgotten her. I say "constructing" because I haven't caught him in any major offense, but there are a few things I've noticed that keep feeding my insecurity. I need to lay these things out because I genuinely don't know if I'm overreacting, and if I am, I truly want to start healing. For instance, the profile picture and name on his private account used to be a picture of them from high school, referencing a movie that held a special meaning for them both. He also kept her old messages and her phone number. The most unsettling part is that this ex-girlfriend remains in the same social circle as his close friends, close enough that her name is still heard frequently. Furthermore, when we first started dating, he was even following her close friends on social media—people he didn't know personally—until I noticed it and he unfollowed them. What truly haunts me is knowing that he even sought therapy because of her. Even if these details seem trivial to an outsider, the voices inside my head, telling me he can't forget her, won't be silenced. I am utterly exhausted from feeling like she and my boyfriend are the main characters in this story, and I am merely the one stuck on the outside looking in.

"I've started having obsessive thoughts about my boyfriend's previous relationship. How can I overcome this?
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