would u say hes def cheating?

so my husband doesnt ever shave off his back burns, but i notice that sometimes when hes going out or going to pick up weed at a friends place, hed shave his back burns off. and thinking about it, he only shaves it off like 3x a year. he usually buys weed from his bro in law. but sometimes he buys it from one of his friend. sigh, i dont quite know how to explain it. but he just doesnt shave off his back burns, he only does it sometimes when hes going out w someone. just having a feeling that hes cheating on me, that hes doing it for another woman. he cuts his hair once a week.