Our insider continued, "There's jealousy on both sides. She flirts, he flirts. She's very insecure to begin with."
Those close to the two of them are worried about what's in store for the future of their marriage.
One thing seems clear, Avril would really like to become a mother, but her rocky relationship leaves her uneasy about starting a family with the Nickelback frontman.
"I don't know what's going to happen. She really wants to have a baby. She was hoping, after this album, to take time off and start a family."