A 29-year-old man messaged his fiancee to say "thank you for the best life" before he was put into a coma and later died after testing positive for coronavirus.
Richard McKeag, known as Ricky, had been working on-call care support shifts before he contracted Covid-19, his partner Katie Martin, 25, said.
Miss Martin, a registered care manager at a supported living service for people with learning disabilities, said web designer Mr McKeag started working with her as a recruitment manager after the outbreak of the pandemic.
The couple, from Bacup in Lancashire, had been working on-call support shifts before they contracted the virus earlier in April.
She said: "I started with a cold and sneezing and Ricky started with a bad cough and he was struggling to breathe properly when he was walking.
"We both had to self-isolate. Because we were key workers we were able to have the test and on April 13 we got a text to say we were positive for Covid.
"Ricky became a lot more unwell and he wasn't able to eat, wasn't able to sleep and was in pain."
Miss Martin said she rang 111 on April 16 because she was worried about Mr McKeag and he was taken to the Royal Blackburn Hospital by ambulance.
After 24 hours of trying to give him oxygen, doctors made the decision to put Mr McKeag into a coma and on a ventilator, she said.
Miss Martin spoke to her partner, originally from Hyde in Greater Manchester, for the last time over Facetime after one of the nurses called her.
She said: "He was the one trying to reassure me and telling me it was going to be OK.
"He said, 'I love you, please tell my gran that I love her'.
"After we spoke he messaged and said 'thank you for the best life'."
On Wednesday, Miss Martin received a call from the hospital telling her Mr McKeag had died.
She said: "The hardest thing is I wasn't allowed to go and be with him, I wasn't allowed to sit with him, I just got a call saying he had died.
"I'm not allowed to see him now or go to the mortuary.
"I'd been with him since I was 18 and we were living together for five years, I just don't know life without him.
"We were planning on hopefully moving into a bigger place and we wanted to get married next year, but we didn't have a date set.
"We were going to have a baby too."
The couple had been engaged since 2017, when Mr McKeag proposed on the plane as they flew to Marrakesh on holiday.
Ms Martin said: "It was the most embarrassing moment of my life but I said yes, obviously.
"He was so romantic and he wanted to let everyone know how much he loved me."
She said Mr McKeag had suffered with asthma as a child but was otherwise healthy and had started regular gym sessions in the months before his death.
She said: "He was really happy and feeling good, positive.
"We just thought, 'we're young, we're healthy, we're all right and there's other people we want to make sure are OK'."
A GoFundMe site has been set up to help with funeral costs.
To donate go to www.gofundme.com/f/xdexs-rest-in-peace-ricky.
