My dad is plaguing me...

I don't even know where to start with this. It is literally driving me crazy.

My parents split in October up after 20 years of marriage. My dad has been abusive to me since I was very little, both physically and mentally. They didn't end it on good terms... The day we left him, he was screaming in my face telling me how bad of a daughter I am, how he hates me and how I'm the cause of all the problems in the family... blah blah. None of this is true btw, I'm honestly a great person and very helpful in the family. Anyways, mum and my 3 siblings and me all took off.

So since October, he's ignored our family... except for the odd e-mail now and again... but it's all pointless stuff where he goes on how he doesn't know why we're not talking to him and such. Life has really been better since he's been gone. I feel safe to go out of town, be out with friends, have company over, etc... We no longer have his rage in the house, it's great.

So since they broke up, he's been driving into town and stalking my friends, go where we normally hang out. He goes over to my friends' houses to talk to my friends' and their families. He never did this before, nor did he ever care who I hung out with.

Anyways, tonight he calls up my best friend and tells him that he got a bunch of free hockey tickets for a game tonight and invites my best friend. My best friend accepts, says he'll meet my dad there... and instantly texts me saying he'll meet me there too. My dad didn't even tell me or invite me... My dad also invited a lot of my other friend's... but I didn't even know about this. I'm in shock, and dismayed between anger and hurt. I don't blame my dad for anything he's done, I believe in my heart that he's got bi-polar or something... but I don't even know what to think... I'm not someone who normally cries over anything... but I am trying to hard to hold back the tears... I'm very hurt... and I don't know what to do??