If there's one thing I'd like to stress out is : how Patrick insisted and stated repeatedly that he truly wants for Lisbon to be happy. 

Twist : He knows she will be hurt, by him ... by this fake relationship ... but he had to do so, because he wants her to be trully happy. Most likely there's not much to Mr.Pike, besides the fact that Jane must think for some reasons that he's a douchebag. Secondly, letting his friend go, the one that has been marked by RJ , into other city - to stay alone with a douchebag is not true happiness - that's why he couldn't let her go.