The invisibility suit apparently also grants the wearer super strength, resistance to any form of attack and an infinite bladder capacity that allows him to remain motionless in the corner of a cell for hours without going wee wee.
The invisibility of the suit is too perfect for the implied technology, with cameras and emitters. I’m an engineer, so maybe this bugged me more than other people, but it just didn’t feel plausible that it could be that good, that flawless based on the suit design as shown. You could maybe hide a plane or tank like that so it’s invisible from a distance, but not a person mere inches away without any distortion. In the similar “crazy invisible guy” movie Hollow Man, the invisibility is some kind of quantum hand-wavy thing, but it’s esoteric enough that it’s easier to suspend disbelief, and the transformation showing the whole body becoming invisible helps to sell the idea.
Also agree that the guy’s behaviour seemed too petty at the start, then even when he had basically won and destroyed her life, he still has to stalk her a bit more? There’s nuts but it’s hard to imagine how this guy could ever even function if he is that crazy. All she did was run away, he could have used his suit to kill her, kidnap her or anything really. It just didn’t seem worth the effort just to “mess with her head” when the suit gives him the afore mentioned super powers.