My ex's cousin sent me a friend request on Facebook, can my ex be checking on me?

Anonymous
I haven't seen or talked to my ex in over a year. We broke up on a mutual agreement. A few months later, he went and married a woman who he now has a child with. Recently, a friend just told me him and his wife are separated and I don't know what that means and can mean a lot of things. Can my ex be checking up on me?
My ex's cousin sent me a friend request on Facebook, can my ex be checking on me?
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