Boseman, 43, died Friday after having been diagnosed with colon cancer four years ago, his representatives announced.
A statement posted to the actor's Twitter account said Boseman had been diagnosed with Stage 3 colon cancer in 2016, but despite medical treatment, it had progressed to Stage 4. He had never spoken publicly about his diagnosis.
In a statement he posted on Instagram, Jordan said he had been struggling to find a way to address Boseman's death.
"I’ve been trying to find the words, but nothing comes close to how I feel. I’ve been reflecting on every moment, every conversation, every laugh, every disagreement, every hug…everything," he wrote. "I wish we had more time."
Boseman died in his home with his family by his side, his reps said.
News of his death sparked an outpouring of grief and remembrances on social media.