Guys, how would you feel if this happened?

You go on a year long trip around the world and before leaving you break up with your gf: you are extremely fond of her and care about her, but it makes no sense to remain together with you traveling for a year, plus you want to "have fun" during your travels. Months later you discover through a friend she was so heartbroken she fell into depression and may even be suicidal. How do you feel?
Guys, how would you feel if this happened?
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