Michael Strahan likes to keep really close track of his women.
When the ex-Giant suspected his longtime girlfriend of cheating, he put a tracking device in her car — and went ballistic when she found it, sources said.
Murphy — a model and ex-wife of comedian Eddie Murphy — and Strahan have been an item since early 2007. They regularly turn up together at red carpet events, and her five kids with Eddie are said to be fond of the NFL commentator.
But Murphy was also involved in a relationship with Universal Records A&R exec Demetrius Spencer.
Introduced by a mutual pal, Murphy had been "hiding" her affection for Spencer from Strahan "for almost a year," the sources said.
Using the excuse of "business trips," a source said, Spencer and Murphy would jet off to exotic getaways in the Caribbean and Mexico.
For several months, the couple had exchanged gushing e-mails, professing their love for each other. In the notes, some of which were obtained by The Post, Murphy told Spencer she planned to come clean to Strahan about their relationship.
But in her e-mails, Murphy wrote she was reluctant to split with Strahan because he'd grown close to her kids.