Why my boyfriend draws picture of his ex?

It's been a while since I've a long distance relationship with someone from a different cultural background, he's from Australia and I'm Asian. I like him and never made him feel like insecure or upset, and he's been my supporter mentally since we met. But for the second time he sent a picture of a drawing, saying that he wants me to know that its his ex girlfriend's face, he said he can't forget his past feelings and said don't be jealous!

It's while she broke his heart and she's married now.

What should I do now? Should I wait?

Why my boyfriend draws picture of his ex?
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