<human>: Can you provide a brief rundown of the text in within 3 sentences?

It's a little long, sorry.

A little back ground first. My parents divorced when i was 12 and me and my brother were sent to my grandparents house to live. They were given custody and so began the cycle. When i was 19, I graduated high school and his excuse for not being there was he didn't have a ride. I offered to give him one but he refused. In the past ten years, I have had to be the one to call him if I wanted contact with him or if I wanted to see him. 
       To make matters worse, he began seeing someone less than six months after the divorce was finalized and I feel like I was replaced by his "new" family. I am so angry and so hurt by all this because he never has once called to tell me happy birthday or anything. It might sound silly to complain about something as silly as this but I can't help but think about all the birthdays he has celebrated with all of them and cannot find the time to make one simple phone call. 
The last thing i have a problem with is the fact that ive been with my boyfriend for  the past three years and I have been wanting to introduce him to my dad. Everytime ive tried it's i dont want to meet him because i dont need to. I just wanted some kind of approval from him because I am his daughter and well, it's self explanatory from there. It seems like he wants nothing to do with my personal or external life whatsoever and it just really hurts.
      I love him, don't get me wrong. I mean, he is still my father but I wish he would start acting like one towards me.
My question is: when do you just quit trying? How should I move on from here in the best case scenario? (If i don't respond for awhile, it is because I'm in class)
<bot>: I'm resenting the fact my father hasn't really tried to be in my life for the past ten years and need some advice on how to deal with this.