*How would he even know that you had contraceptive pills? You can easily get your prescription renewed and no one is going to tell him. The only way for him to know was for you to tell him you had them. Also, why didnt you just present yourself at a police station, womens aid or council homeless department?
You don't understand the fear of being caught breaking the rules and the consequences of it. You tow the line even when your abuser isn't there because your life won't be worth listening if you are involved in any sort of defiance.
You also underestimate the psychological effects of abuse. Abusers aren't awful all of the time, there is a carrot and stick mentality and a cycle to abuse of building tension, explosion, making up, and then calm. You get told that the explosion part is your fault and then during the reconciliation and the calm, your abuser is loving, kind, protective, and you do come to think it's your fault. I thought I was a worthless, unloveable, nasty, selfish, manipulative child and teenager because that's what I was conditioned to think. During the tension building stage we would all hear about how we were getting too big for our boots, that we were ungrateful, that we were spoiled, that a "talk" was coming, that our attitudes were disgusting and we had better adjust them or we were going to find ourselves taken down a peg or two and so on so that when the explosion did come it had already been established ahead of time that it was our own faults and that we could have prevented it if we had heeded the warnings and tried harder not to be so uppity/selfish/spoiled.
And then during the explosion you're ground down to nothing, lower then nothing, because that's the bit where your abuser shows you exactly how little you mean both to them and others. During the explosion was where my father would pack our bags and shove us out the door. Eight years old, shouted out of bed and kicked out by your dad late at night clutching a Care Bear suitcase with the warning that youd probably get picked up by the Bad Man before the police or a kind stranger and would be murdered in a ditch by morning. Do you know how frightening that is? And it was no good telling our korhwr because he did it while she was on night shift and he told us that she had put him up to it because she was just as disgusted by us as he was. No good complaining to a teacher or another adult because why would they believe us? Children lie all the time and we were already proven manipulators so why would they believe us over him? And then we'd pay for embarrassing him when we got home, he guaranteed us that. And if they did believe us then we'd be taken away and put into care. Did we know what sort of vile child abusers worked in the care system? If we thought he was bad wait until we were living with foster parents who wanted to beat us or rape us or starve us. He never hit us, he only told us off when we deserved it for being naughty and of course he had to be robust with the telling off or how else would we learn? And then we'd move into the reconciliation stage where he'd be sorry for being so strict and would make us realise that yes, we had been the wrong, and that yes we did forgive him of course we did, there wasn't anything to even forgive then on and on it went.
Police station, Womens Aid, council homeless department, and so on aren't immediate. They can't swoop in like Batman and spirit you away whilst protecting you because services don't work that way.
You have zero understanding of abuse and your comments about "why don't people do this or that?" are victim blaming.