The couple met when they were just 10-years-old and have been inseparable ever since.
Things have certainly changed though as the star's hectic schedule has kept them apart.
A friend told sources:
"Things have been under pressure for ages between them and they have finally realized that things are not going to be able to progress. Leona's schedule means she's in the States a lot when Lou's in London and then when he goes out she's over here. Then there's the fact she's been totally immersed in preparing for her tour. They have barely spend any time together whatsoever."
Sources also say that when Lou didn't go to Leona's performance at London's O2 Arena, it was "the final straw."
Leona later tweeted this on Saturday:
"Thank u for being so supportive. Remember to always shine and never let anyone dim your light. U have the power within to achieve everything"
Meanwhile, Lou got serious when he tweeted:
"Do what you want no what society expects, live how you like not how other like you to live. I walk alone you may walk beside me but never will you lead. I'm just doing me…"
Intense! 10 years is a long time to be someone! We wish these two the best!
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[Image via WENN.]