I have to say, we're all on some kind of road something like this. It may not be physical; Jesus said it doesn't have to be physical to be wrong (as in Matthew 5:17ff)
Many times you do what you've come to be raised to do. There are other ways. They'll take awhile to get used to doing. You'll feel strange, maybe even fearful. It's all part of learning to "be vulnerable". It takes toughness to be vulnerable; it doesn't take much toughness to lash out, everyone feels that anger.
It's important though, that you don't focus so much on your own response that you neglect your responsibility to your friend. You both belong, when you are redeeming one another: when what you do, helps him to sin less; when what he does, helps you to sin less. If your appreciation for him leads you in this way, that's good. Take it to heart, and work on yourself.
But don't think for a second that you need to be "so holy" that you have no emotional reaction; or that you avoid sharing things that would change or improve his walk with the Lord and his truthful, honest relationship with you, as well. Your emotions need to be shared when they're redemptive. There will always be an opportunity to share when the event becomes redemptive.