I would agree with that but lucilla says it hurts maximus more.

I agree that it had absolutely nothing to do with Maximus not being noble.It may have been political, but it had nothing to do with nobility.

>I always interpreted it like Maximus is the ultimate straight arrow. Lucilla is still a politician born into politics. They aren't compatible people although they might have had an interest in each other growing up. I interpreted it like Lucilla did what she could to survive. She's not evil like Commodus but she's not a hero like Maximus.

So did this affect luccila's choice of who she would marry? Is maximus' allusion to this?

It is actually very common for soldiers to marry empire girls. In real history, Lucilla marries a Syrian general.

There are 2 possibilities in the movie, either Lucilla's choice or Lucilla's family.

so whose choice was it,Lucilla or her family?Actually taking the title of princess after her marriage with Lucis Verus(co-emperor)