I’m so upset

I’m scared my insecurities are going to ruin my marriage.. I’m feeling so low and disgusted with myself. Every little thing is being magnified right now and I’m making myself believe it all means he’s either cheating or falling out of love with me. He swears nothings wrong but I just feel like he’s more distant recently. I don’t know if it’s all in my head or what… if it is I don’t know how to fix it.