I told my girlfriend, I know of some others here who did. Things I feel you should do are written here
In my case it went really well and she was able to understand it (probably because she has some mental problems too and hence was able to feel with me)
In the case of cr1s it didn’t went that well. Unfortunately, I think he is not active anymore, so he can’t talk about his current state. he told that it opened a gap between them.
It really depends on you. I felt like I have to tell her. I wasn’t able to lie to her anymore. So, there really wasn’t any option for me.
I also think that it is important that you can show her your plan. Don’t just talk about your problem but also about your solution and idea how you can get out.