For what it's worth, I don't think that Frank was trying to re-ignite an old flame. I hope not anyway. Although I appreciate and agree that even calling an old flame could lead to that.
I don't think he was either. But he's treading on dangerous ground seeking validation elsewhere at THIS time. He's all kinds of vulnerable right now. It WAS good for him to see the other side of the coin again BUT he should be really careful because the lines can blur really easily right now.