The 27-year-old basketball player was said to be staying in a hotel in Ohio, Cleveland, after video footage emerged online last month of him appearing to kiss a mystery woman in a night club in New York City while the 'Keeping Up With the Kardashians' star was heavily pregnant.
However, after weeks of working through their relationship, the sportsman is believed to have moved back in to the family home in Cleveland so that he can help his girlfriend - whose family all live in Los Angeles - care for their three-week-old daughter True.
A source told People.com "Tristan is now living back with Khloe and their child in his Cleveland home, although travelling frequently due to the NBA playoffs. She's [Khloe] focused on keeping her family together. She seems okay with Tristan."
It was rumoured that the couple - who have been together since 2016 - had managed to work through their differences after Khloe changed her mind about moving back to Los Angeles.