Betrayed him as in going to his brother who is in case fire/cold war, he was treated disrespectful compared to his older brother and ridiculed, without encouragement.
Terrible parenting, how to build siblings rivalry, lower self esteem and personal value.
Are you guys that fucking dumb?
Relationship with engagement between Cedric and Eileen was purely political, they might have been "friends" but it appears it was one sided from Cedric, since Eileen didn't knew how to be compassionate and supportive since her father was a dick. Only thing keeping them together was a piece of paper and ink.
Reason why Lilia swooped Cedric so fast was sincerity, compassion and being supportive, basis of a healthy relationship. There's no spells or charms... geez...
Finally,
you dense fucking idiot sandwich "make you cry" doesn't necessarily mean "perverted sm route" you horny cunt that's dry as a desert dune. There's something like tears of joy.
It would be a shame if Cedric went down on crazy route, that would be stupid...]