It's wrong to betray someone in a relationship.
Corrie is in a relationship with a girl that he no longer feels the same for and his heart is wandering.
Corrie wants to pursue another relationship.
Corrie ends things with his current partner before dating the other woman.
Corrie gets involved with another woman while he is still in a relationship.
The other woman is happy that Corrie has come into her life.
The other woman finds out that Corrie isn't single and distances herself from him.