Like happy helper, I think a counselor is a good idea.
Our emotions can feed our mind the wrong ideas, jumble things up and before you know it you are mixed up and getting things out of whack.
In a relationship your aims should be to be as relaxed as you can get with each other which must include trust, space, plans, commitment (depending on the conditions agreed), benefit of the doubt and care. In your case its sort of as if you feel insecure and it comes across like anxiety hence best to seek counseling. Counsleing is no big drama, think of it as an insurance for getting things into better perspective.
Many years ago I had issues with realism. I would allow my thoughts to wander into fantasy. I'd worry my boss would knock on my door even on a Sunday morning. My therapist identified this and taught me to discount thoughts that were not realistic. Even today 33 years alter I still ask myself that question and if it is a fantasy I move on quickly, it a control I'm glad I now have.
In a way that same discipline allows you to discount assumptions which in a relationship can become dangerous. eg if he is enjoying company of a few friends and you feel he is spending too much time there then later you find out he went to that friends place to celebrate his friends birthday then study together and so on. Hence the "benefit of the doubt" which is part of trust. Trust until proved otherwise is a part of a relationship unlike a new friendship where its the other way around.
I hope that helps.