The couple announced earlier this week that they were going their separate ways after six years together and Nikki has been relying on her sister Brie to keep her positive.
A source told E! News: ''Nikki has been really leaning on her family thoughout this break up, especially Brie.''
Meanwhile, it was previously claimed that Nikki is ''heartbroken'' about the end of her engagement.
The insider shared: ''He's an incredibly dedicated, driven, ambitious guy. And for the longest time he said he didn't think he had room in his life for a spouse or kids. It seems like in the end that was still the truth ... Now she's heartbroken.''
The pair announced their split in a statement released on Nikki's social media account.
It read: ''While this decision was a difficult one, we continue to have a great deal of love and respect for one another. We ask that you respect our privacy during this time in our lives.''
John had admitted last month that their relationship takes a lot of work.
He explained: ''Relationships are hard. Don't ever think that love is easy. Love is beautiful, but we've had to come to the realisation after being together for five years that love is not easy. We work every day on us. We have our problems just like everybody else. Some of our problems are very public, some of them aren't. But we work every day on us. Anytime I get upset, I always just realise that I can't live without her and I love her and that's why I cave in on a lot of stuff. It takes being able to mesh two lives. I would never ever want Nicole to be in a position where she says, 'I'm holding you back from doing this because I feel it's wrong for us.' And I would never say that to her. That's why she's super busy and sometimes we don't see each other for months at a time, but when we do see each other, it's our time together. I think, for now at least, that is certainly what's making this work.''
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