Self-care is important, so is self-protection. I have personally made a point of eliminating or distancing myself from those who bring negatives to my life as opposed to positive. In order to be happy, we must be around those who lift us up and enhance our lives in positive ways. No room for negativity if one wants to be happy, or else you're going to feel negative yourself. So kudos to you for stating these things to yourself, knowing your limits and boundaries and drawing lines!