I'm extremtly bothered

So...my SO and I have a awesome sex life, sex every night and any other time we can get it in lol. however, Friday after work my daughter grabbed the trash can and tipped it out and all of this tissue falls out that has been crumbled up and she goes to put in her her mouth and I'm like "NOOOO" that's nasty. well well...it was his cum tissue that he used after I left for work. same thing happened yesterday as well..again once I left for work. I'm sorry but i do feel EXTREMLY offended and I can't help it because I get him the 😺 everyday!!! I just don't understand Why? I mean I do occasionally masturbate but it's like once a mth I sware to you..he does it all the fucking time I feel like and it's so nasty to me. on top of watching porn. I'm certainly letting this affect my relationship with him and it stresses me out. I need some advice and help please!! I really don't want to be controlling and at times I feel like I am but I truly don't understand why he needs to wack it when I'm always around and he knows all he has to do is drop my pants! Like I would never tell him NO