<human>: My dad left home when I was very young, about 2 years old, and I've always liked to think that I understand why he did it, that he wasn't happy at home and that he'd rather leave than stay in a loveless marriage and have us resent him for it.
He started his own family, I still see him lots and I have a young brother of 13, through my dad and stepmom. 
Now I can't help but feel angry with him, for the situation he left my family in - my mum as a single parent, having to rent a home she could barely afford, working constantly and us still struggling for money. We had bailiffs constantly knocking for us, my mum became bankrupt, all this from when I was 10 to about 18. Life was very hard and we struggled - my Dad gave my mum child support but very little.

Now, my Dad's son has it all - he's basically an only child because he is his mother's only child, and is treated as such: completely spoilt, gets everything he wants. He hasn't know struggle, but I can't blame him for that - he's just had a comfortable upbringing. 

But I resent my Dad for not helping more - I struggled financially through uni, and with the little support he did give me, he acted as if he'd done me some massive favour. It was recently my 21st, and I got a card and a bit of money, whilst my little half-brother got a fancy meal out and all. Everything in my life I have made for myself, or got through the incredible support of my mother who pushed herself to the absolute limit to help us get.

Give me the gist of the text in a nutshell
<bot>: My father left when I was young, left family in dire financial straits, his new family have a very comfortable life. How can I stop myself from resenting him?