My boyfriend (18M) and I (18F) have been together for almost 2 years but I can't seem to shake my trust issues. Rationally I feel and believe he would never do anything to hurt me, but when I get even the slightest bit anxious, the little voice in the back of my mind tells me he'll find someone better and either leave or cheat. I get so anxious and obsessive over this that every time he opens his phone I feel like he might be texting someone else then proceed to ask what he's doing and overthink every little detail of how he answers.Because of past extremely unhealthy relationships I'm constantly waiting for my world to fall apart. I over explain and apologize for nothing to make sure I don't cause any issues even now that I'm in a healthy relationship and don't need to. I know he loves me and he tries his best to always be supportive with my mental health, but I can tell it bothers him. We both want to make sure our relationship stays healthy and work on anything we need to, but I don't know how to even start working on this, it's one of my biggest issues and the biggest strain on my relationship. I only recently got my diagnosis and havent gotten myself into DBT yet, if anyone has any advice on how I could ease this stress or something I could ask my boyfriend to do for to help idk. I feel like I don't even know what I need myself, I just want to be able to give my trust to the people who deserve it.