Despite Church's current relationship with Jonathan Powell, she is "hurt" over the prospect of seeing the rugby player in a Spanish villa with 25 pining girls, a source told Star magazine.
"She couldn't help feeling upset and hurt that Gavin is going to be dating all these other women on national TV," the insider claimed.
"Charlotte says the thought of watching him fall head over heels for someone else is horrid - especially as these girls are all so gorgeous."
Church and Henson have two children, Ruby and Dexter. The couple broke off their engagement and ended their five-year relationship in May last year.
Channel 5's Bachelor adaptation represents Henson's latest reality show venture, following his appearances on Strictly Come Dancing and 71 Degrees North last year.
> Gavin Henson's The Bachelor: Meet the girls