I broke up with my ex around 8 months ago… But suddenly that started being a very painful topic for me to even think of. Is that normal?

We broke up due to being unable to agree on some important life matters. It’s been 8 months. I am seeing someone casually now for a while but recently the whole breakup started getting to me more than it did at the beginning. I don’t know why is that. I really feel bad about it lately. I can’t understand why. I am usually so over every relationship as soon as it ends. Why did this hit me so late after the break up?
I broke up with my ex around 8 months ago… But suddenly that started being a very painful topic for me to even think of. Is that normal?
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