The reality beauty, who is expecting their first child, gushed about their loving and understanding relationship as she handed out some advice to her fans ahead of Valentine's Day .
The Keeping Up With The Kardashians star, 33, said that she's never felt so safe and comfortable with someone as she does with her 26-year-old beau.
Khloe wrote on her app : "My answer for this probably doesn't apply to everybody, but I knew Tristan was the one very quickly - I have never felt so comfortable or so safe with someone.
"Because of that, I took it very slowly and was cautious about how I went about 'us'. I made sure we had very in-depth conversations. I wanted to make sure that those conversations were backed up by actions.
"Tristan was so forthcoming with his life, as I was with mine. It was really reassuring to feel that someone had the same belief systems as I did.
"We spoke about religion, children and our families. I think all of those things are important to truly know the ins and outs of someone.
"It's really easy to fall in love with someone during a honeymoon phase when you haven't yet discussed the logistics of life. But you have to talk about the real things if you want a real/long-lasting relationship."