1)
Why did he say "Chalilah Li me'Chato?"?
1.
Rashi: If you will due what is incumbent on you, to repent to Hashem, Heaven forbid that I would refrain from praying for you!
2.
Radak: If you will repent to Hashem and confess your sins, I would sin if I refrain from praying for you!
3.
Malbim: Do not fear that I will cease to protect you with my merit. I will continue to protect you in two ways. (a) I will pray for you. (b) I will teach to you the proper path.