Why do they do this

So me and this guy I just have sex with nothing more nothing less keeps taking the damn condom off when we have sex 😠😠😠 last night we was having sex and I noticed it's feeling way more skin on skin like feeling as I got up to give him some head the condom was off wtf man why do guys do this shit😠😠😠

-i got pregnant one time which ended in a miscarriage and I was like how tf I was pregnant and I figured it out he was taking the condom off and I called him and he was all like "how that happened" "its no way" "we use a condom everytime" and I told him be honest with me that you took that condom off when you was doing doggy style and he told me. Then I stopped having sex with him for a while then I did again a month ago and he did it again im so over this