Have you ever ended a relationship with a longtime partner, only to see that person live it up with someone else on social media?

Actor Brian Austin Green knows what that feels like, because he was married to Megan Fox for a decade until they split earlier this year. 

Soon after, Machine Gun Kelly slid in and started dating the Transformers star, which seemed to be confirmed on Instagram. The Ohio born-rapper recently said on social media that he found his ultimate mate in Fox, so it looks like they're really into each other.

Green spoke about his ex and MGK being an item and talked about how he found out about it, even though he didn't provide any details.

“I found out in my own way. And that’s as much detail as I’ll give you on that one. I didn’t read about it or anything like that," said Green on the Hollywood Raw podcast, according to ET Canada. "I try to not read anything or look at anything and not involve myself in it. Just keep my head down and do what I do and focus on the kids."

Do you see MGK and Fox being in a long-term relationship or are they just having a fling?