my boyfriend stuck his finger in my ass?

okay so we smoked a joint or two came inside to watch tv i was falling asleep and i kinda wake up to a weird feeling like he’s sticking a finger in my anus and i get up and i’m really angry and i go make food, but idk why he would do that or how or like anything? he’s never wanted to anal or anything so i’m super confused. has this happened to anyone else? he didnt say anything about it other than he was really sorry.