How to be calm and content in a relationship?

I have been with my boyfriend for a little over two years now, however I have known him for years. We have always been really good friends and our parents are best friends too. He's amazing! but there has been a few issues in the past and present. My boyfriend has always struggled with drugs and the first year of our relationship he was on drugs, I knew about i but my mom didnt until she caught him one day and now HATES him....well things are getting better anyways but its been over a year since my mom caught him doing drugs and things are finally starting to get better, hes been sober for almost a year now and he just got a new job so he's very happy. The drug incident definitely crushed our relationship a bit but were finally starting to get over it and now I'm realizing all the issues I have now that I dont have to worry about him. My dad died almost a year ago and that has been a huge struggle for me, along with that I've realized I get VERY anxious over every little thing that happens in my relationship, I overthink EVERYTHING!!! I overthink things from his text messages to his phone calls, if he doesnt say I love you everytime we get off the phone, then I flip out and think he doesnt love me anymore. my boyfriend is veryyyyy passive and I am high strung so I always want things done now now now and want answers NOW and he's the complete opposite. He let's things go but I dont. I'll sit and read into everything and over analyze and talk about it for 2 hours whereas he starts to get annoyed. I always think theres an issue just because he's so passive! and now that things are finally starting to look up and there arent really any issues I try to make issues which causes big fights between us! In the beginning of our relationship my boyfriend was very obsessive (probably because he was on drugs) but now he's not obsessive, he's calmed down a lot and gives me my space which I freak out over because by him starting to calm down and not be obsessive I take it personally and think that he just doesnt love me as much as he used to or whatever!!! I always try to talk to my boyfriend about this but he gets mad because he tells me there isnt an issue with us, Im just trying to create an issue. I always want to fix things and now theres nothing or no one to fix I freak out! I dont know how to allow myself to just be happy and be content with the fact that our relationship is finally getting to where we've wanted it to be! I need advice please!