Why does he mean

We just had the talk of what are we and we didn’t really say exactly he said it’s up to me what I think we are and he said that we’re dating and he was cool about calling him my boyfriend! After two days we were talking through text about one of my fears which are spiders and he said “I feel like killing spiders is on the list of boyfriend-ly duties” just exactly how I typed it. I’m not sure if that’s a thing? I’m not sure if he’s joking around about him being my bf or if he’s acknowledging for sure that he’s my boyfriend. I’ve never seen the word boyfriend-ly before and I’m not sure if that mean a male friend or if it’s a saying that refers to an actual boyfriend