Does it get better?

i’m 23F newly diagnosed ROCD is my main theme past 3 months, first 4 months it was existential OCD. Does this get better? Does it go away? Will I grow out of it? I’m in a loving relationship for about a year, this man will be my husband I already know it. But I can’t stand myself. I don’t look for reassurance from him, mostly friends instead. He is so perfect and I would do anything not to lose him. My OCD is telling me recently that he will stop loving me and leave me. I recently moved up from our apartment to school and that’s when those thoughts started. I also went a couple of weeks where I wasn’t totally drowning in my thoughts but was being attacked in my dreams. I’m a very morally sound person, I overthink interactions i’ve had with men and the magical thinking says I emotionally cheated. I have bad scrupulosity too if you can’t tell lol. I always worry about being a terrible person, to anyone not just him. It’s attacking me in my dreams, cheating in my dreams with very random people, people I haven’t seen or spoken to in over 10 years, or a random coworker. Why? Literally why? I go a few days no troubling or crippling thoughts and I have to have a dream that I wake up from in complete disabling anxiety thinking I genuinely cheated on my bf. Now I’m thinking did I cheat and i won’t admit it to myself? Am I manipulating myself? Am i a liar? I’m being consumed. I need advice. I just recently started ERP and 5mg Lexapro so far. Is the lexapro responsible for these damn dreams!? I’m scared of medication but know it helps. Please any advice helps. Thank you for reading.