I don't fake. My Man can take it if I don't come. And, if I don't he knows we need to continue to work on it, if I really want to. Why should I miss out?
A few times, a long time ago, when I was having a lot of problems with climax I did, but I realized I was reinforcing techniques (and time frames) that didn't work for me, and he was thinking this stuff was working. That wasn't good for either of us.
You both need to work on what works, and if necessary, SHOW him what works for you, if he can't get you to orgasm. Then he can try it. If necessary show him what toys work for you, so you can use them together.
You both benefit from honesty.