This The Mentalist screencap might contain
traje de negocios, juego de negocio, bien vestido persona, juego, juego de pantalones, traje pantalón, persona bien vestida, traje, pantalones traje, pantsuit, pantalones de traje, retrato, tiro en la cabeza, primer, headshot, primer plano, en la cabeza, and closeup.
The writers and actors don't want those two to get together. In fact, they laugh at the fans that want them to. Which personally I find a bit rude, but I won't get into that. Anyway, their reasoning for them not getting together (at least right now) is "they have más of a brother/sister relationship."
I'm sorry, but every time someone is trying to make an argument for why two people shouldn't be a couple, it's always either "they have no chemistry" o "they have a brother/sister relationship." But I've never seen anyone deny Jane and Lisbon's chemistry, so I won't focus...