Relationship Drama: Losing Motivation

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to make a long story short... me and my boyfriend broke up. I did it-- we didnt have time to see each other outside of classes.

And now... my best friend... who I dished out all my relationship problems to... is telling me she is in love with him.

It's my fault. I know. But I can't seem to get myself together and stop crying.

Anyone been through something similar? What did you do?