Overthinking in relationship (20/f 20/m)

My and my bf (20/F 20/M) have been together for over three years and we never get into arguments. But before I met him I was in a really mentally and emotionally abusive relationship that has completely altered my mind. And basically tdy me and my bf were texting earlier in the day and everything was fine and usually we ft to go to sleep but he’s ignoring my txts and calls. I’m unsure why but whenever he does this I can’t help but overthink that he’s mad at me or I did something wrong bc that’s what my ex used to do. I do know that when we have gotten into arguments he’ll walk away to get space which I’m fine w i understand that but this is completely diff bc we didn’t argue. I also know that if other things piss him off he’ll want alone time. But I just simply don’t what to do bc my mind can’t stop but think he hates me he doesn’t wanna be w me anymore. I don’t know if I need to do some self healing bc of my own overthinking issues or if I need to tell him that he needs to answer me?