Why do you think Carlos and T.K. broke up on 9-1-1: Lone Star?

Before a new episode of 9-1-1: Lone Star airs tonight, I was wondering if you had any thoughts as to why Carlos Reyes and T.K. Strand broke up? The first episode of this third season, The Big Chill revealed that the fan favorite couple had broken up. I'm sure at some point, viewers will find out why but until then I wanted to know what you thought about it.

I have three theories, the first is Carlos proposed and for some reason T.K. turned him down and then broke up with him. Although, T.K. loves Carlos, he's not sure he ever wants to get married and broke up with Carlos because he didn't want him to have to settle for a relationship where he won't get everything he wants out of it.

My second theory is that the trauma from the house fire might have caused them to distance themselves from each other instead of talking to each other. More so from T.K. than from Carlos. Although they both nearly died in that fire and they lost everything they owned as well. I feel like the fire coupled with the 126 fire station being shutdown might have been a bigger distance inducing factor for T.K. causing him to get scared about the future making him want to end things with Carlos because he felt like he couldn't deal with everything including being in a relationship.

My third theory is that after Fire Captain Owen Strand knocked out Billy Tyson after he announced that the 126 fire station was being shut down that when Billy came to he wanted Owen arrested and charged. And since Carlos although off duty was on the scene, he unfortunately had to arrest Owen and that caused an issue between Carlos and T.K. resulting in them breaking up.

Well these are just my theories, what are yours?