Why do we experience anxiety when going through a break up?

My ex and I broke up last weekend. It was the right thing to do given the circumstances that occurred and that's that. We were together over a year so I am sad things haven't worked out because I did love him. The main feeling I have though is anxiety. Every morning I wake up and I can feel it in the pit of my stomach. I know it's there throughout the day too but I don't notice it as much because I keep busy. I can't understand why I have anxiety over it though. I also had anxiety when my first ex broke up with me but it was on a much larger scale and again was so confused about why I was experiencing it. Anyone have any idea why we feel anxiety while going through a break up?

Why do we experience anxiety when going through a break up?
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