The actress, who is currently starring in new Sky comedy Gates, told The Sun that she hates being away from the former Emmerdale star.
"I love them - anytime and anywhere," she said. "I'll ping one across when James is doing a voiceover or filming then he can't concentrate!"
Page added that she found it difficult when her "soulmate" Thornton was away filming Emmerdale, in which he played farmer John Barton.
"People say it's healthy to spend time apart in a relationship, but for us it felt so wrong," she explained.
"I really relish that he comes in at night and we have tea together now. It's amazing having him back."
Thornton's character was killed off in a car crash in February.
"Those scenes were awful," Page concluded. "He even brought his order of service home from the funeral which was freaky!"
Thornton previously confessed that he quit the soap to spend more time with Page.