Boyfriend never flushes and it’s getting me irritated.

Hi guys,

So every time my boyfriend uses the bathroom he never flushes. I always have confronted him nicely about it and he claims he did. It’s just us two in the apartment. I always flush. But he claims that it’s not him. This is really frustrating me. He says that I’m just picking a fight with him when I always talk to him about this.

Please help.