Is it possible to be heartbroken after seeing someone for only 3 months and knowing them for 5?

Anonymous
This guy and I ended things about a month ago. I had known him for 5 months when we ended. We were seeing each other weekly for 3 months. I feel like my feelings are invalid because it was only 3 months and seeing him once a week but here I am with all the feelings and symptoms of a heartbreak that I haven’t ever felt before in my 26 years. I’ve had relationships that were longer and guys I saw more often and ended it and didn’t look back or feel much, or at least if I felt sad I didn’t feel like it was the end all be all of my life. But here I am, extremely upset and heartbroken especially since I know I allowed myself to be treated in ways I should never have allowed and it makes me feel rotten and disgusting. I feel fully to blame even though I know he was a jerk and was dishonest and just was selfish the entire time, I still allowed it so yeah. Anyways, is it possible to be this heartbroken or am I crazy or immature or one of those psycho weird obsessive girls? I think about him 24/7, mostly in pain.
Is it possible to be heartbroken after seeing someone for only 3 months and knowing them for 5?
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