Loose vagina

So my bf got mad because he sat im cheating on him because today I wasnt in the mood to fuck and then when inwas giving him a blow job I got on top of him for a couple of minutes because he said my vagina was loose. After that he wouldnt talk to me and when I asked what was wrong he told me that he feels like im cheating because my vagina was loose and i ditn wanted to fuck. I feel so sad that he thinks that about me because i love him so much I would never do that to him. It keels me that he says im a cheater when im not and Im always woth him. What can i do to tell him Im not cheating. I told him already but he doesnt seem to understand. Im so sad