Single Dad needing candid advice.

I am a single dad with custody of my teen daughters for the last few years.My oldest is now finishing her freshman year of college. She wanted a serious conversation with me prompted by me asking a few questions about my parenting.Here is the deal... she pointed out that my bitterness over her mom leaving was taken out on her "she could do no right" and I would "cut her off emotionally if she upset me". Ouch!!! I am open minded and took what she said to heart.We are very loving and open with each other. I think that's why she felt comfortable talking to me about this. She also said that I haven't done this in a long time and that she wanted to address it. She said she is concerned that I might do it again. She also says I never did it to her sister and is concerned that I might do it to her.I want to never make her feel this again by my actions.Any advice, resources, links?Thanks via /r/Parenting http://ift.tt/2pj0r9J