Why do I feel so guilty

So my fiance works away, not that it really matters some questionable things I've found lately have me not wanting to touch him anyhow but during the week while he is away I will pleasure myself almost every single day while the kids nap. I've caught him videoing himself masturbating (idk y he was) but even though I know he does it I still feel guilty everytime I do, like I'm doing something wrong that I shouldn't do. Does anyone else feel this way and how can I stop from feeling guilty. I don't do it to anyones pictures, sometimes I will watch porn but usually I don't need it I don't even use a toy I use my back massager and the vibration alone does it for me so i can't understand why I feel like it is wrong like I said I know he does it often