Travis Barkernever thought he would fly in an airplane again after he survived a deadly 2008 crash — but thanks to now-fiancéeKourtney Kardashian, he’s been able to see air travel in a different light.

For years, the crash — which killed four people, including Barker’s assistant and security guard, and left him with third-degree burns on more than half his body — was “just too traumatic and painful” for the blink-182 drummer, 45, to ever consider flying again, a source tells PEOPLE.

For more onKourtney Kardashianand Travis Barker’s engagement news and other top stories, listen below toour daily podcast PEOPLE Every Day.

The insder adds, “They started out with shorter trips and he was doing well with them. He wants to make memories with Kourtney.”

Kourtney Kardashian and Travis Barker in Paris.Travis Barker/Instagram

Kourtney Kardashian and Travis Barker

The insider says the blink-182 musician is “relieved” to be okay with flying again, and though he’ll “never love” it, he “feels great that he got to this point.”

“He loves seeing Kourtney excited when they take trips. He focuses on this,” the insider says. “Kourtney never put any pressure on him to fly. She was just there to support him. Travis gives Kourtney a lot of credit.”

Barker toldNYLONin August that hehad a deal in place with Kardashianin that she had to give him 24 hours notice to fly, and he would.

“It’s still something very new to me, but having something that gives me the strength and hope to be able to overcome things that were so traumatic in my life, it just says a ton,” he told the outlet. “She’s definitely that for me. I’m invincible when I’m with her. It’s just like I never dreamed, I never even considered flying again.”

Travis Barker and Kourtney Kardashian.Jeff Kravitz/Getty

Kourtney Kardashian

A source previously told PEOPLE that theengagement was a “complete surprise"for theKeeping Up with the Kardashiansalum, but that her family knew.Kris Jenner,Khloé KardashianandTristan Thompsonwere among those present for the proposal.

This will be the third marriage for Barker and the first for Kardashian, who confirmed the news on Instagram with a caption that simply said, “Forever.”

Kourtney shares sonsMason, 11, andReign, 6, and daughterPenelope, 9, with exScott Disick, 38, while Barker is dad tostepdaughter Atiana, 22, son Landon, 17, and daughter Alabama, 15, with exShanna Moakler, 46.

source: people.com