Lennie was introduced as Whitney's boyfriend back on Season 2; they ended up calling it quits on Season 3, Episode 9. On MBFFL, Whitney explained she felt stuck and like they weren't moving forward in their relationship.
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"I realized maybe I have needs that he can't meet or doesn't want to meet," Whitney told the camera before breaking up with Lennie face-to-face. "I need a relationship where I feel like I'm not asking the other person to change."
Not long afterward, Whitney had a pregnancy scare — but it turned out to be a false positive.
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It looks like fans will have to wait until Season 11 (assuming there will be one) to find out where Lennie and Whitney (and for that matter, Whitney and the Frenchman) stand today.
In the meantime, you can rewatch Seasons 1–10 of My Big Fat Fabulous Life on the Discovery Plus app.