Puffy eyes... SO doesn't trust me

I have been with my SO for 1 year and 9 months. I can't tell you the number of arguments we have had because he tries to connect things that aren't connected and he jumps to the conclusion that I'm lying or cheating. And every time the issue comes up it's like my heart breaks into a million pieces and my body physically hurts that he thinks that way about me. I try to be the best girlfriend I can be. I love being with him. I love him. And I don't know how he can continue to question that I'm honest and loyal.

We got into a major argument tonight. I'm a counselor that goes into homes to do family sessions with kids and their parents (which I'm working on finding a different job where I won't have to do in home counseling). My session ran over about 10 minutes more than planned. He called and sent me a text while I was wrapping up. I called him as soon as I got to the car but he thinks that I only called him when he texted me. But I didn't even know he texted me until I got to my car because my phone was on silent during the session. Then he connects his suspicions there to thinking it was weird that my body was hurting today, but that was because I worked out for the 1st time since forever yesterday so I'm very sore and he knows this. But now things don't add up to him and he thinks I'm lying. Smh. We argued for almost 2 hours. I was driving and had to pull over to a parking lot to talk to him because I was so emotional. I just hate that this continues to happen. We got to an ok place tonight but I'm so tired from the argument that should have never happened and am just feeling hurt. I just want him to trust me. I feel like I should have earned it by now. He has questioned me so many times. I thought we were passed this. I'm sick of having to defend myself or prove that I'm doing what I say I am doing. Idk what I'm looking for with this post. Anyone come through something like this and it get better? Just want feedback I guess.