I think corrine was so in love with Gideon she would take anything she could have with him, she obviously realised something was amiss and hence called off the engagement hoping it would get his butt in gear but we all know that backfired (thankfully!!)
Defo true about Gideon burying his head in the sand. At one point did he not say to Eva that he never felt his past was a problem until he met her? He didn't think it affected his life in anyway, it wasn't until Eva forced him to open up and also how his nightmares were affecting him that he probably realised he might actually need some help!