Brian Austin Green is looking back at a previous chapter in his life.

Six months after the Beverly Hills, 90210 alum called his romantic relationship with ex-fiancée Vanessa Marcil "toxic," leading to a contentious online back-and-forth, he revealed what he learned from their 2003 breakup.

"It was a very tumultuous separation because you have this thing in your head of like, you want to win," Brian —who shares son Kassius , 23, with the General Hospital actress— explained on the Nov. 25 episode of the Inside of You with Michael Rosenbaum podcast. "You want to be the smarter of the two. You want to be acknowledged for that. So you've got these unrealistic expectations and both of us did. So it was extremely tumultuous."

When he began dating

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