Aww, no, that's so sad.
Friends Reunited has a lot to answer for.
Ending a relationship is a horrid decision ... I did it mmeself earlier this year.
But ... if you do end it ... don't feel bad about it.
One of the few things that you should give to your friends, and your boyfriend, is complete, unquestionning, loyalty.
And you should expect to get the same back.
If you have that, then nothing else matters, and everything else works.
If you don't have it, then the relationship is built on shaky ground.