Help! I think I'm missing something here...

[[deleted user]]

I'm at the part where Marthe tries to make Lymond kiss Phillipa and he refuses which provokes some conflict. It ends with Phillipa running out of the room when Lymond threatens to describe Guzel's naked body.

Okay, so far so good.

Then we get to the part, where after Phillipa leaves on her own, Jerrot finds Lymond out in the rain with his face in his hands. The passage is as following:

The rain beat Lymond's darkened hair into his hands and the barmi produced Russian arpessios of emerald fire, keyed to all the irregular gusts of his breathing. Beneath his hands, his lips were parted.

Jerott's anger vanished. He placed his palm on the other man's shoulder. The sleeve and the flesh under it were both badly chilled. 'Come in,' he said. 'You can use Adam's rooms.' His hand, moving upwards drew the fair, tangled hair clear of Lymond's eyes and checked, at the shudder that ran jarring through from his fingertips.

Lymond dropped his hands. He made no protest. He did not look up. But inempeded at last, Jerott could see the look on his face and give it, sickeningly, its correct interpretation.

"Oh God in heaven,' said Jerott Blyth. 'You bloody, arrogant fool...'
He sat back suddenly. His own arm, supporting him, was unsteady. 'Why didn't you accept Piero's offer?'

'I don't know,' Lymond said. It was not easy to hear him.

'You out to know!' said Jerott wildly. 'You're not a priest. You fight. You live on your nerves as we all do. Then you can't touch a girl, in case you leave your senses and take her. Is that what happened?'

I suppose so,' Lymond said. 'It might have bound me to her for life.'

Can someone please explain what's going on in this scene.
I get that Lymond refuses to touch Phillipa because he's scared he'll forget and go too far.
I'm just not sure of how much Jerott knows. Did he just have this huge revelation and is now aware that Lymond loves Phillipa? And what "offer" is he talking about...forgive my poor memory but I have know idea.