Any tips on how to keep my LO from biting me. She got her bottom two teeth and she just loves to use them on my nipples. Also what should I do when she does bite me?

My sweet baby girl gained her angel wings this morning. She was my best friend, my true love my everything. She was so happy and beautiful, I'm struggling to say good bye. Sleep tight princess, mummy and daddy love you very very much ❤️
Eliana just pointed at my leg and said "bite" and then she bit me so hard! 😒

Her helmet she got so she can be safe (as she told me) when she rides her bike and scooter lol
Yesterday I went out with my boyfriend went to watch a movie, me and him don't live together yet. but point is yesterday when he was dropping me off his like sleep over at my house witch the mom and dad lives. I said no,
his response was why is everyone deciding or making choices for you and their going to do the same with the baby, when I know that's not true. what he thinks is that my mom tells me not to sleep over. So he left all mad. and I felt in my heart that he went on and cheated on me...