I just don't get it

You know when it comes to family I'm always there for people but when someone screws up the relationship between me and them for the gazillionth time it's like them saying that they hate me and never want anything to do with me anymore. I won't name names but my birthday took place over 9 days ago and I got facebook im's, txt msgs, and phone calls. The one thing I didn't get was msgs from my bff's from logansport which was just a stab to the heart for me. Then what made me even more pissed off was my so called father not calling me on my day. He just txted me which he thought would just do. Here's a clue for you better think again. I'm not upset really because I expected it...I'm just pissed off to the extreme because even my mom mentioned that it was ridicolous that he didn't even send a card like he does every year. I mean even people that I barely knew from school wished me happy birhday. My sister in-law said though don't let him ruin my day. It's my DAY. So when it hit midnight that night.. then I could be pissed. But like my mom said it wouldn't do any good because he will never change. So why am I trying? I mean even my stepmom and sister msged me on facebook. I just think that mine and my father's relationship doesn't make sense anymore. :/ i just don't get it