Dean admitted toAccess on Wednesday there were "a lot of issues" with their relationship.
"I have trust issues when it comes to a lot of things and I always felt like there was a switch that would get turned on, especially to kind of peddle it out to the masses. It never really felt super, super genuine," Dean explained.
"Just recently I was talking to a friend who was at Winter Games and they were saying how, when the cameras were on, you know, I'm not going to badmouth Lesley because she is a great person, but there was a noticeable difference between how someone was acting between when the cameras were on and when the cameras were off."
Dean added, "Again, I'm not going to say anything negative, but I don't really like that stuff."
Although Dean is leading fans to believe Lesley was fake in their relationship, he praised her new romance with Dronegear founder Alex Kav.
"Good for her. The universe works in weird ways, I guess," Dean said. "I'm happy for her. Hopefully her and her boyfriend are super happy."
Dean insisted he "never" wants "to get in a Bachelor relationship again," so fans can bank on the fact he will not be appearing on a future edition of Bachelor in Paradise or any other spinoff.
"[It's because] there is an inkling or whisper of a possibility that the other person might be in it because they see the value in it monetarily or whatever, social status wise," Dean admitted on Access.
In October of last year, the podcast host explained to Us Weekly he'd like to stay away from Bachelor Nation relationships for as long as possible because there is "so much pressure" placed on them.
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Dean entered four different relationships with women over the course of his three appearances on The Bachelorspinoffs.
Dean failed to commit to either woman, and then he went on to date Lesley on The Bachelor Winter Games.
When updating fans on their seemingly strong and happy romance during the show's World Tells All reunion special in February 2018, Dean got down on one knee and presented Lesley with a key to his apartment rather than a diamond ring.