What should I do for this problem.?

Ok, a couple months ago, I lived in Oakland California with my mom, brother, sister, and step dad. But I wasn't making good decisions, as in, being suicidal and getting sent to the hospital numerous times, gettingbad grades, and other stuff. So my mom made me move with my dad, his wife, and their two toddler daughters. I felt as if I was being robbed of everything that was important to me. But after a couple months of going to a new school and making somewhat "friends", I kinda liked it in Stockton California where my dad lives. But one thing I don't like is all the nagging and fussing my dad emits to me and all his B.S rules. That gets to me. But I realized staying out of his way works. Pay attention to this, because this is the main point. One day I was riding my bike and I seen a girl. We talked, played pool at her house and went inside her house, and when i left, I knew she was the girl for me. After a couple days, we started to hang out at her house, cuddilng or holding hands watching tv, (she even gave me my first hickie) and I think I'm in love. But, a week ago, I left her and my dad to visit my family in Oakland for spring break and my mom keeps saying when my school let's me out in May, I'm coming back to stay for good. I don't want to leave my dad's house because of everything I got there. Even Tatiana (the girl) and I don't want to leave and give her up just so my mom can see me graduate at my old school. She's not giving in, I think she really wants me to stay and it's making me angry because Tatiana (the girl) and me just might become boyfriend and girlfriend, and she would be my first. Should I stay with my dad and Tatiana or come back home?