Metcalfe admitted that her split from the Dancing on Ice skater after two years feels "like a death", The Sun reports.
It has been widely rumoured that Ghadie and Longchambon have entered into a relationship with one another following their time together rehearsing for the ITV skating show. Ghadie's relationship with former Coronation Street co-star Will Thorp also ended recently.
Metcalfe met Longchambon when they appeared as skating partners on the 2011 series of Dancing on Ice.
Speaking of Ghadie in the aftermath of the affair claims, Metcalfe said: "She left me gutted."
Metcalfe also revealed that she had no idea that there were problems in her relationship.
"You grieve for all the plans you had in your head. It is a grieving. When you cut someone out of your life like that it's pretty harsh," she added.
"Our relationship was great, a really good two years. Marriage and kids were in vision. I loved the guy unconditionally inside and out. He adored me in every way."
"Things were still great in the bedroom. As far as I was concerned the chemistry was still there."
Metcalfe told of how Longchambon confessed his feelings for his new skating partner early on Christmas morning.
"In the early hours of Christmas morning he told me on the phone that Samia and himself had had a conversation about their feelings for each other.
"He didn't go into detail. He said he fancied Samia but in the next breath he said he loved and adored me - so try and get your head around that one. It felt like the worst Christmas morning ever."
However, the Hollyoaks actress revealed that Longchambon denied cheating on her but admitted that they had discussed their feelings for each other.
She said: "I asked the question about whether he cheated on me with Samia. He said 'no'. That is good enough for me."
"Sylvain wasn't too clear about what Samia said - I don't think he wanted to give me all the details to hurt me anymore. I did ask but he didn't tell me. Did I get the truth? I don't know."
Metcalfe pulled out of her appearance on Tom Daley's diving show Splash! following rumours of an affair between Longchambon and Ghadie.