The couple - who had a turbulent relationship during the recent series - said that they have even considered how many children they want to have together.
Waltz told OK! Magazine that she fully trusts the Blue singer, despite his behaviour towards Casey Batchelor in the house.
She said: "I trust him more than anything. I don't feel betrayed, I know how he felt about me but I also know the situation he was in.
"I don't think he did anything wrong aside from one little kiss in the bathroom, but he was being manipulated and Casey was pretty keen.
"So I went back into the house at the right time because if that had dragged on for a few more days it would have got to a point where I wouldn't have gone back to Lee."
Ryan added: "We've spoken and said if this isn't real let's just walk away, but we're totally in love. Who wants to go into a relationship thinking it could end in heartache? So we're open and upfront."
He went on to admit that although he wants "to rip her clothes off every five seconds", he feels his relationship with Waltz is "deeper than that".
Speaking about having children together, they agreed that they would like three or four.
Waltz said: "I'd definitely like to adopt too and bring someone into a home who didn't think there was much hope."
Read the full story in this week's OK! Magazine - out today (Tuesday, February 11).