While Katie shared how it's been difficult for her to leave the house, she wrote on Wednesday how she plans to "accept what is and learn and grow from it."
Katie and the wildlife manager reportedly broke up on the weekend of October 22 after the former bank marketing manager performed stand-up comedy for the first time in front of an audience at a show in Anaheim, CA.
The Sun previously reported that Katie flew up to Canada early Saturday, October 23 -- just a few hours after the comedy show -- to address problems she and Blake had been having and putting off for many weeks.
Multiple reports have circulated that living in different countries and trying to make a long-distance relationship work is why Katie and Blake's engagement failed.
Katie just moved into a new San Diego, CA, apartment in August, and Blake -- who lives in Toronto, Canada -- often travels to Africa for his endangered-animal conservation efforts, most recently involving the rescuing of rhinos.
Katie reportedly missed Blake when he was gone and wished he could be with her more; however, neither person was allegedly willing to move for the other.
The Sun reported the breakup was "not one person's fault," infidelity had nothing to do with it, and Katie and Blake had simply "rushed into things."
A third source told Us Weekly earlier this week that Katie "won't give up on love and still hopes to get married one day."
When Katie and Blake released their joint breakup statement on social media, they called themselves "grateful" for the moments they had shared but said it's "the most caring choice" "to move forward independently."
The pair ended their brief statement asking for "kindness and privacy" as they navigate "this transition" from being an engaged couple to being single again.
Katie and Blake's breakup announcement came only days after Katie admitted she had been "totally winging" her relationship with Blake following their televised engagement.
"I'm, like, totally winging my life right now," Katie had told Us.
During the Us interview, Katie -- who originally competed for Matt James' heart on The Bachelor's 25th season -- had sounded somewhat indifferent about her relationship with Blake, who first appeared on The Bachelorette's sixteenth season last year and joined Katie's season several weeks into the process.
"We're figuring it out," Katie had said. "We don't know. This is very new to us still. I'm just focusing on myself, he's focusing on him, and if we work doing that, great."
The couple's breakup may have shocked many fans because two weeks ago, Katie had taken to Twitter and clapped back at speculation she and Blake had called it quits.
On October 15, Katie tweeted a screenshot of one of her recent Instagram comments that read, "You and Blake are not liking each other's posts. Is all OK?"
The screenshot showed that Katie immediately responded to the fan, "Yes," with a tears-of-joy emoji.
Katie tweeted alongside the image, "Imagine your fiance has been on his [Instagram] stories for weeks in Kenya working his ass off and yet this is what some people notice," in addition to another tears-of-joy emoji.
But when Blake left for Africa to focus on saving animals, Katie reportedly wrote on Instagram earlier this month, "It can feel lonely moving to a new state... I've had trouble sleeping lately... I'm still trying to navigate this new life and city while seeking normalcy."
When Katie and Blake were still together, they had said they were in no rush to wed and intended to travel together and learn more about each other's backgrounds, interests, hobbies and hometowns before deciding on an "anchor spot," or city in which to put down roots as a couple.
"I don't think people fully understand what it's like to date someone from another country and the rules behind that and the visas behind that," Katie said in a series of late-August videos posted to her Instagram Stories.
"I think right now Blake can only be here for 60 days before having to go back to Canada. So we really do have a lot we have to look into -- and we just haven't yet."