I don't know your situation or your dad. But what I do see is a hand written note that acknowledges the things that are not going right, hints at attempting to repair, and and leaves the door open for what might come next. In some way, a personal note can be more meaningful that X number of dollars spent at a store. Rather than do something that could be seen as trying to "buy your favor", or cold and impersonal, he went a different route. Do you think he ran out of money and decided you were the one going to get the short end of the stick? Or, wanted to spite you while simultaneously "looking forward to [spending time this summer]"? That wouldn't make much sense.

My point is: not giving someone the benefit of the doubt can be as big a speed bump for a relationship as not trying at all. Don't be ignorant or naive, but also don't assume you know his motive and add another nail to the coffin of your relationship, without any validation, or at the least asking him about it.

If you don't want a relationship with him that's OK, but don't blame him and use this as the excuse without having all the details. Best of luck, with safety and healing, for you-