The 'Keeping Up With The Kardashians' star and the 36-year-old beauty went their separate ways last month and it appears that Scott is missing having his ex-partner by his side.
Captioning a photograph of his place marker, which reads ''Scott Disick Guest'', at a friends' wedding, he wrote: ''When u realize the grass isn't always greener (sic)''
Meanwhile, a source recently claimed that the 32-year-old television personality - who has Mason, five, Penelope, three and Reign, seven months, with Kourtney - ''really screwed up'' again.
They said: ''[He] started talking about being the father he was supposed to be ...
''[But] it was like he undid all his progress from the past week and then some. He really screwed up, again, and the entire family knows all about it.''
However, things haven't been easy for Kourtney either as an insider has revealed she is trying to ''figure out'' how to move forward.
They added: ''For the first time, she's taking a hard look at what her new reality could look like.
''Before, she just assumed nothing would really change, but now there's a strong possibility of life without him and that's a scary thought for her. She's figuring it out and taking it as it comes.''