I am feeling distrustful to everyone

Hi. I am 17 years old. I am in a relationship with someone for 2 years. (we broke up, then got back together a lot last year but now we are over all of those issues. we know each other for 4 years also) I am diagnosed with depression since I am 14 and am taking medication since 15. I also had self harm but I am clean for 6-7 months now.

I am feeling so down, and I feel like everyone is talking, doing things behind my back. my life is on track again finally, I was in a really bad condition last year. everything is good. I am with the guy I love for 4 years, my family and school are also good. I am successful. but nowadays I am feeling paranoid about everything. for example, I know what my boyfriend does right now, I know who is with him, he calls me, texts me, lets me know.. he behaves really good, since I talked him about these feelings. but still I am paranoid as hell. I feel like he hates me, cheats me.. same for my family, and friends. not just about him but mostly about him because he is my weak spot. I care about him so much.

so, what should I do? I'm feeling even more depressed because of my 'paranoia'. I am still taking meds, btw. please help.