Why would my boyfriend be cheap with me but not with his ex?

Anonymous
my boyfriend and my anniversary is next week last night we were in an argument and he said "geeze be happy I'm going to spend like a thousand bucks only on our anniversary!" it got me upset ONLY our anniversary? he spent thousands to go to Hawaii with her...she was a bitch and abused him and he gave her everything she wanted. he bought her a 500 dollar diamond necklace, he bought me a 200 dollar diamond necklace. I'm usually not the kind of girls to be all about money but its kind of getting to me that he used to spend more on her, even though I'm nicer! I finally gave in and asked him if we could go overseas sometime soon and he blew me off. I don't understand, why would he want to give her the world when she was so mean...but not me? it makes me feel ugly and not as important...
Why would my boyfriend be cheap with me but not with his ex?
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