I would tell her but I can only speak from my own experience. It kinda depends on how secure you are in your relationship.
I guess you have a few options.
#1. If you completely trust her and feels she values your need for privacy in this delicate matter, then you should tell her. Don’t just tell her you’re making your dick bigger but rather give all the facts. Tell her about the process, how it’s done, why you’re doing it, what benefits it has etc, and tell her that you’re careful and sensitive about the matter. You might even wanna tell her about this forum and that you’re talking to hundreds of people (just giving a number, dont know how many members there are) that are doing the same thing and are supportive to eachother about it, so she knows you’re not alone doing this.
#2. Dont tell her at all. I personally dont recommend this cause I wouldnt want to live in a relationship with a bunch of secrets, trying to get swing away from questions that will eventually raise up.
- Why have you been in the bathroom for so long?
- Oooh, I’m, uh, just takin a shit baby.
- For thirty minutes!??
When she is starting to notice that your dick is actually bigger she’s gonna want some answers, and if she’s not getting answers I bet she’ll start speculating on her own, and probably not in a good way.
#3. Tell her that you are doing some exercises to increase your penis health and nothing more. Dont tell her about increasing size but merely about increasing EQ and general health. If you’re working out in anyway just tell her that taking care of your body includes your entire body.
#4. Lie your brains out, about everythng. Avoid all subjects at hand and steer off from all conversations including this particular matter. <— Defenitely NOT recommended.