Does the feeling of heartbreak last forever?

I love my girlfriend dearly with my whole heart but in the end she dumped me without a second thought. It's been three weeks but I can still feel my heart breaking every second. It is killing me and I'm literally dying right now. People told me that time heals everything but I'm not sure if I can make it. She's the only one I had and once she promised me she'd never leave me no matter what happens but she broke her promise along with my heart.
Does the feeling of heartbreak last forever?
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