Earlier this year footage emerged of Thompson, 27, with other women - just two days before Khloe was due to give birth to their daughter, True Thompson.
It was later confirmed that the NBA player had cheated on Kardashian with five women, all while she was pregnant.
The couple welcomed their daughter, True, on April 13.
The couple have been actively working on their relationship, and the future looks bright for the doting parents.
'She seems happier and happier every day,' a source told People.
'Khloe wants to get married eventually, but there are no serious wedding talks yet,' the source continued.
'She does talk about a future with Tristan, though. She believes they can figure things out and have a happy life together. True is doing great, too. And Kris is so proud of all her grandkids. She constantly shows pictures of all the babies.'