She simple just use him, thats what it is... She knows he is obsessed about her and take all advantages from it. Even if she wanted to break up with him, she just play with him like a toy. And thats really sad, cause he deserves better. :/ I, of course, can't say, if Amy would be the better solution in some ways, but much better than Penny indeed. Honestly the only girl I really liked with him and who seemed sweet was Alice. What a pity he had no chance anymore... :S Leslie sucked, Stephanie sucked and Priya anyway! So yeah Amy wouldn't be that be for him :S