Progressively feeling negativity towards someone

We all dislike someone or the other, after all we are human and have our own preferences. I've felt negativity towards people before, but its just fleeting moments. If its been with someone close to me, I still kinda know that it was just a moment and haven't held these moments as determining factors of our core relationship. And I've certainly never had it fester in me to a point of developing irrational hate towards them. If I do not like the way someone has treated me, I've simply been able to put distance between us. I now find myself developing consistent irratation, frustration and dislike (maybe even hate) towards someone I can't actually distance myself from coz for various reasons. One is that we live together. I know this person isn't a bad person, and the things that get to me can often be dismissed, ignored, or even just accepted as part of who they are. But I feel this growing negativity towards them and I am at a point where I actively want to complain about them and talk about these negative qualities and experiences I'm having with them to others. I'm supressing this urge at the moment because I know its not right, I don't believe in talking badly about others unless it is to actively help someone else. I guess I'm posting on this group to ask, how can I stop this horrible, ugly feelings I have towards this person? Its like I have an actual grudge against them. I have never felt that before. I believe in acceptance of the good and bad and I believe that I have no right to judge another let alone chastise them even if it is just in my own heart. I've experienced way worse treatment and situations in the past and this hatred has never clung inside me like it is now. I believe in complete honesty and I feel ashamed to be in this household and talk to this person as though I am okay with certain things when I'm not. I'm ashamed that I have complained about events that have transpired with them and have let my ugly judgements and dislike slip. I don't want to hate anyone within me nor in person. How can I let this go? I'm not the most religious but I am hindu and have my spiritual beliefs that are guided by hindu philosophy. Please help me. What guidance does Hinduism offer to let go of negative thoughts and feelings towards another? Sorry for the long post.