You were raped. You might want to go to a hospital, both to see if there's any damage done (sounds like there is) and to document this. Consider going to the police.

You know those times before, when he'd try to sneak anal sex when you were doing it doggy style? That was already a red flag. Be picky. Don't tolerate any guy who continuously tries to force your boundaries. A guy who respects you will always ask you before trying anything, they won't be waiting around for opportunities to get what they want when your guard is down.

Don't stay with this guy, his behaviour is predatory and he violated you. And whoever you date in the future, don't be afraid to walk away when you feel uncomfortable and distespected. You owe people zero leniency, it's perfectly OK to end relationships as soon as you feel like they're not trustworthy. You don't ever owe anyone any chances, ever.