Hey ladies.
This is totally un-WL related, but I really could use some help on this.
WARNING: This is long. I appreciate you reading it in advance.
My dad and I basically don't have a relationship. Following an abuse situation when I was 12, I didn't live with him anymore and saw him only every once in a while. At the end of high school I started running the office side of his business, so I saw him occasionally, but tried to schedule my time when I knew he'd be out of the office. Since I've been in college, I've seen him probably twice a year and it's just totally awkward. He's very socially awkward just by nature, but the history of the situation doesn't make it better.
His wife has a tendency to give horrible horrible gifts to my sister and I (She doesn't really know us at all), so we've started just asking for money. Since both of us are in school, it's really the best gift anyway. Sometimes it's $50, but recently, he's given me (not my sister. only me. weird.) two very large gifts (in the $1000 range) after I had a very long and painful conversation with him about how he has never contributed a dime to my education (My mom gave as much as she could, but I'll still have a ton of debt) and how his absence has really affected me as an adult.
This Christmas, I asked for money and he said that it was fine, and said I should be receiving a nearly $1000 check. I said that I would appreciate it more if he just took that and split it between me and my sister, which he said he would do. She's really needing money for school, and I didn't want him to just give me a bunch of money and her none as he's done before. After not receiving anything or any more word (including a phone call on Christmas or New Years...he was in North Carolina with his wife instead of spending it with us

), my sister talked to him recently and apparently he plans on sending it in "weekly installments", which means we probably will not be receiving anything.
My dad isn't rich by any means. He owns a small business and lives pretty simply. The fact that he ever gave me $1000 seemed weird, but now the fact that he offered it and now isn't delivering is even weirder.
Should I talk to him about it? Or just give up and figure that he's always been unreliable and he'll always been unreliable? I don't know what to do since I was really counting on that money to help with the coming semester. I have enough to pay for my tuition, but I was planning on studying at a specialized program during the summer that, now, I may not be able to save enough for.
Any thoughts, ladies? I'm really stuck here.
I want to give him the benefit of the doubt, but he's let me down so many times before that I hate to set myself up for disappointment again.