Big Bang Theory: The Real Reason Only Penny Could Make Leonard Truly Happy

screenrant.com:

There's a reason why only Penny (Kaley Cuoco) could make Leonard (Johnny Galecki) truly happy on The Big Bang Theory. From the get-go, it was clear that the show was gearing up for a romantic relationship between the pair. Despite this, dating each other wasn't easy, especially at the beginning. But eventually, it became clear that no one was better suited for Leonard than Penny, and it had something to do with his best friend Sheldon (Jim Parsons).

Penny and Leonard wereThe Big Bang Theory's original love line, although Howard (Simon Helberg) and Bernadette (Melissa Rauch) got married first. Ultimately, they tied the knot together in season 9, initially through a shotgun wedding in Las Vegas, and then a proper one with all their loved ones present. However, due to the show's shifting focus, the couple's story became stagnated for several years. While they had their respective individual arcs, nothing was going on with Leonard and Penny’s married life; at one point, the sitcom even addressed this as characters themselves realized how boring they became. But this didn't have anything to do with their compatibility, it's purely a lapse in judgment from the show's creators. 

Related: Big Bang Theory: Why Penny's Hair Is So Short In Season 8

Overall, Penny and Leonard were a good fit for each other. While it wasn't mutual at first, especially since the latter fell in love at first sight, over time, they became attuned with one another. Penny forces Leonard out of his comfort zone, while he balances it out by grounding her. But there's one particular reason why only Penny could make Leonard truly happy—she also loved Sheldon. Throughout The Big Bang Theory's run, Sheldon latched on to Leonard. And, despite putting him through