Brother heard me masturbating

I’m 18 and I’ve been masturbating since 16 since it released my stress and period cramps. That’s healthy right? So every night or so I masturbate and usually everyone is dead asleep by 10 or 11 so that’s when I do it. My brother moved in recently. He is a night owl apparently which I didn’t know. So some nights I let myself moan since it’s hard to keep silent at night. So he just bursted through my door just now an accused me of watching porn (which totally isn’t wrong and I’ve watched it before just to get me in the mood) which I rarely watch because it’s porn and people shame you for it. He said he heard sounds from my door one night and said that it isn’t healthy to watch porn. And if I were to watch porn I’d wear headphones. So that mean he probably heard me one night or something which is stupid it’s normal to masturbate. I still live at home so im afraid he’ll tell my parents! I’m not sure if he’s lying about it just to get me flustered or actually meant it