Boy Trouble. Help!!

Okay, so this is complicated. I've been talking to this boy since September. We started out as friends, and then we would hold hands everyday, he'd put his arm around me, and would always hug me. November rolled around and he started acting weird, turns out he got a girlfriend. I was fine with it and tried to move on. Now, December, we started going back to the way things were at the start. So we're always texting and flirting, along with flirting and constantly touching throughout the day, but neither of us have talked about having a relationship. So what do I do???