By ROTS? Yes. Before ROTS? To a degree but he didn’t know the full scope of it.

Agreed.

I'm pretty knew they were romantically involved even before ROTS but as we got closer to ROTS i think he knew more

This is really more of a fact than an opinion. TCW establishes that Obi-wan did know about Anakin and Padme, though he may not have known they were married (and therefore lying to everyone around them).

Yes much later on in The Clone Wars and in Episode III he knew

Bro, my guy Obi-Wan was trolling anakin this entire damn show lol. He hinted his knowledge of theaffair so many times even in front of Captain Rex. Though Anakin was not very discreet about it anyway in front of Obi-Wan lol

It wasn't an affair...it was a marriage

Yeah before the marriage and also after, but i noticed it more before the marriage.

He definitely knew about them as he even reflected on his time with Satine Kryze

It’s made clear in the ROTS novelization that he did