Reba and Brock
My hot take (maybe it's not-idk) is that Brock never stopped being in love with Reba. He wouldn't have married BJ if she wasn't pregnant, and clearly regretted it later on. I do think that Brock and BJ's personalties make more sense than Brock and Reba, but I was always rooting for him to come back to Reba to be honest. I did love BJ though just as a side note. She was really well written in that she was likable despite being a big part of breaking up the family.