1 switch 1 copy - can I play with two players?

I keep getting not straightforward or contradicting answers. Sorry if this has been asked. I want to play It Takes Two with my boyfriend. I have a switch(1), he does not, I have multiple controllers. Can I buy one copy of this game and play split screen with him on my switch, or does he have to be playing from a different system or another switch or buy another copy of the game?

:) Thanks in advance, just want to make sure before going forward with buying. We don’t game together much, he’s not super into games & we don’t have a lot of free time, and if this is a hassle I’ll skip it.