I just want it to stop

I've been in a relationship for about a month and it's been going really well. But literally almost all the time i get these waves of anxiety about what could be wrong in the relationship or trying to figure out what is happening that might cause it to end. I know it's an anxious attachment, ive had this happen before in a relationship that led to it ending after 4 months. The intrusive thoughts, the what it's, the exhausting over analyzing every move is just too much. I'm aware of this and I just want to enjoy my relationship, my thoughts are so hard to control sometimes. It's most likely a mix of my own insecurities and just overall mental state, but damn its just too much. I really loke this girl and everything shows thar she likes me, but my brain keeps telling me to doubt her interest in me, her wanting to have a future with me. And I don't want this to end up like my last relationship where i just ruined it because i wouldn't just trust her (it wasn't like horrible or anything, i was just making her lose interest because i kept wanting reassurance). at the start of the relationship I was fine? but idk what caused me to just start overthinking like crazy.