Overthinking Advice

Ra

Hello! I need some advice on overthinking. I cant seem to stop no matter what. I always have high anxiety and I’m always worried my boyfriend will cheat on me. He shows me nothing but love and loyalty and he gives me all the reasons why he wouldn’t/why he’s not going to. I don’t know how to put my full trust in him and I’m so worried he’s gonna get sick of it and leave. How do I trust better? How do I get over my fear?