The actress admitted that she is feeling angry after reading reports which suggested that her relationship was on the rocks.
Writing in her New column, Marsh commented: "A women's magazine ran a totally untrue story last week, saying I was about to dump Jamie.
"To put the record straight, Jamie and I love each other and are getting married this year for crying out loud! These sorts of stories are so pathetic - it makes me mad."
The couple, who started dating in June 2008, became engaged last Christmas.
Marsh, best known for her role as Weatherfield barmaid Michelle Connor, recently confirmed that she is planning a small wedding and will tie the knot with Lomas in the summer.
