You have to be naive to believe that Cindy falls in love with Ian when clearly he is a way out of her stagnation and where you can see a clear attraction that she feels for Axel, we may possibly have options to be closer to Cindy, but at what cost?
Just because she thinks "Axel is hot" that does not mean she can not also feel "I love Ian". I am married, and love my wife. At the same time I think a lot of women are hot. That doesn't mean I don't love my wife or love my wife any less.
As for him being a way out of her stagnation, that is true, but that doesn't really change anything.
Her cheating on Wade to be with Ian could be a problem. When a person cheats that don't tend to change that behavior. They say, "Once a cheater always a cheater." So, there is that reason not to trust Cindy. However, that is not always the case.
The reason why she cheated on Wade is that he was both physically, and emotionally neglectful of her wants and needs.
I think the way this will play out is:
If Ian is a "Chad Ian" where he is fucking every woman he can. If he got Alice, and Lena and some other side bitches. I don't think Cindy would be faithful to a player.
However, I think if Ian only sleeps with Cindy, and at least nobody else that is in the "She could know about it / find out about it" Camp. I mean, Ian might be able to get away with Minerva for example because she is not really a part of that friend group, and has no contact or association with Cindy. There is no contact between those two as of yet.
On the other hand...
I could be wrong. Maybe Cindy has been riding Axel's dick for months.