Worst part about being in a relationship

I've suffered with anxiety for as long as I can remember. Lately my anxiety has been worse.. and it's affecting my relationship. I feel like I'm going to have a panic attack when my boyfriend is with his friends. I start thinking irrationally about what he is doing and who he is with. He's always been faithful to me. Deep down I know that he wouldn't do anything to hurt me but that doesn't stop my anxiety from playing with my head. This makes me feel like being single would be so much better than being in a relationship. I love my boyfriend so much but the amount of anxiety I feel being in a relationship is intense. I can't handle it 😫