I hardly talk to my boyfriend's mother.
Is it because you have some sort of problem with his mother?
I hate her she does not approve of my boyfriend and his lifestyle.
Even though you might think it's justified, it's concerning and inappropriate that you dislike your partner's mother so intensively. Even if you don't always see eye-to-eye with her, it would be a good idea to try to maintain a cordial relationship so that your partner isn't torn between you and his family. Improving your relationship with your boyfriend's mother could induce her into being more understanding and accepting of your boyfriend.
I can only say I have nothing against her anymore.
I am glad that you seemed to work things out, it is always important to try and be close to your loved ones family members. Even if you dislike them, just keeping things civil can be very important to your mental well-being.