Will she cheat again, the second time around?

My cousin's wife had a disastrous first marriage; she & her husband both cheated. After divorcing, she met & married my cousin 15 years ago. She's very outgoing, the "life of the party" (without being vulgar), & has many friends, of both sexes. (My cousin is also friendly but a little more reserved.) She travels... show more My cousin's wife had a disastrous first marriage; she & her husband both cheated. After divorcing, she met & married my cousin 15 years ago.
She's very outgoing, the "life of the party" (without being vulgar), & has many friends, of both sexes. (My cousin is also friendly but a little more reserved.) She travels some for work, sometimes with a colleague (male or female), he doesn't. She also occasionally has drinks after work with colleagues (but it's never late).
They "seem" happy but lately I've been getting a weird "vibe" around her. They're heading for their 40s; what about mid-life crisis?
My cousin is a real sweetheart; he would never cheat. I'm not so sure about her.
What about that saying, "Once a cheater, always a cheater."?
I know it's their marriage but I worry for my cousin. He's one of the "nice" guys!
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