After thinking about some it. Ian x Cindy is somewhat shit storm of a route for these reason alone.
1. You're screwing over your old friend who trusts you.
2.You're going the mostly lose Emma, Perry, Lena, Holly as friends because they would disgusted and disappointed of Ian.
Alison I think she's going to be mixed on it but will mad in a sense that Choose a taken girl over her when she's completely single. I say mixed because she was in unhappy relationship with someone understand moving on someone else but won't agree with the cheating.
3. He's no body than Axel and Gillian. Ian freaked on his friend's girl and lied about it constantly; honestly Ian is doing the same thing that Gillian boyfriend did and Cindy is Gillian and Wade is Ian in the situation.
Ian is going to make Wade felt the same way he did when Gillian cheated and left him.
I have feeling one of the friends is going to call him out on it and say the same thing. I bet you it's going to be Perry, Wade or Emma who says it. I will be shocked Gillian found outs about it and somewhat Judge Ian for being hypocrite.
I just know storyline won't end if he's also fooling around with other girl; it's scarier if you're freaking Alison, Cindy, and Emma they'll be angry with him even more.