I hate my mother in law

I just can’t fucking stand her. I do everything in my power to make sure i treat everyone kind and respectful and it’s not enough. It’s always about me taking her son away from her. I’m about to leave my boyfriend cause I cannot stand to see her fucking face. I ask the Lord for forgiveness because I have tried and tried to forgive her and move on but whenever I think of the things she’s said to me it makes me hurt and lingers in the back of my mind and it’s taken a huge toll on me. I have been nothing but fucking good to her and I’m just hurting. I have always pictured myself with a MIL who loves me and appreciates all I’ve done for her son. One that treats me like the daughter she always wanted. But once again life fucks me over and gives me her instead. My boyfriend does not correct it at all and makes excuses for her and he expects me to forgive and forget because he knows I have a kind heart. And I’m not some little gf that’s been around for a little bit. I’ve been with him for four years. I’m so fucking frustrated and hurt. I don’t know if I can be with him anymore