The 32-year-old didn't seem too heartbroken over the news of his ex dating someone new.
Robert has been around the globe promoting his new film, High Life. The movie also stars Mia Goth, Shia's ex-wife whom he filed for divorce earlier this month.
Shia and FKA met on the set of their new movie, Honey Boy. The 30-year-old singer confirmed their romance by saying, "We're very happy, we're having a nice time.”
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Robert and FKA had been dating since September 2014 and were engaged until their breakup in the summer of 2017.
A source told HollywoodLife that the Remember Me actor has no problem with his ex moving on. The insider revealed, "It’s really not in Rob’s nature to get jealous. If FKA is with anyone he only hopes that she is happy. Whether it is Shia or anyone else he is OK with it because, in life and relationships, you have to move on.”
R.Patz has been dating model/actress Suki Waterhouse since earlier this summer.
Do you think Rob is actually jealous? Sound off in the comments below!