Samuel Witwicky has continued fighting side by side with Optimus Prime and the remaining Autobots against the Decepticons for years. It was a continuous struggle to find the enemy, for they always remained hidden in plain sight. Sam didn't miss his old life a bit. He enjoyed every bit of his new life because he enjoys hanging out with the Autobots and the military task force, NEST.
He also enjoyed doing the mechanics of every mobile vehicular thing he could get his hands on. The Autobots were, in a way, his office or his garage, ever since he helped revive Optimus when Megatron took him out. There seemed to be less resistance from the Decepticons. But he hasn't let that fool him due to his experience with them.
But lately, he's noticed that there seemed to be some tension between Ironhide and Optimus Prime; more than usual, to say the least. Even though they didn't agree on a lot of things while battling against Megatron and his goons, Ironhide and Optimus have always been the two best drinking buds from a nearby bar, getting into bar fights while hitting each other with pool sticks while drinking a cold one.
That's just how Sam saw it between them. But he hasn't been following up on their arguments lately to know what exactly seemed to be causing the issue, the tension that he notices now. Unfortunately, he did get a small piece of information from Bumblebee, who used various moments of "Pretty Woman" with "The Jungle Book" vultures singing "We're your friends till the very end", that the tension between Ironhide and Optimus involved a girl.
Sam simply had to laugh because that was simply so unlike them. Doing that type of cock fighting was beneath either of them, in his opinion. It's childish, thought Sam, never in a million years.