I can relate to you a little bit. My mom cheated on my dad with a family friend. I used to be very friendly with him until the day my mom and dad seperated and got their own house. My sister, brother and dad moved into one house, my mom , her boyfriend '& I in the other. 11 months later, I still have a hard time adapting to it. I must mention, I hate every single thing about it. Whether It's his 1 eye, his goofy laugh, or how he's very selfish .. I dislike him. Also, I can relate to your birthday story. When I was turning 13, my mom never came home to celebrate. She was out watching a movie with her boyfriend. I waited for her to come home for 4 hour before finally being convinced to blow out the candles. Anyways, I think that your mom and you need to agree on seperate conseiling. You both are going through an extremely desperate phase of sadness, anger and loneliness. You need to take some time and sit down with your mom '& talk things through. Share your opinons '& emotions. I'm sure there's a lot more to the story than you think. Be considerate and try to understand how your mom feels.
As hard as it may seem to do, you need to try.
@ is it okay if i feel sad or cry about it ?!
It's never okay not to feel sad and cry about it. Crying relieves pain '& sadness. Imaging going a lifetime with distress and anger without crying. That'd be tough. Cry when you need to cry. It'll make you a stronger person, I'm sure.