There is an age old saying - the truth always comes out
Eventually, your wife, girlfriend, significant other etc. will find out about your steroid usage. It's inevitable. She will be more upset about the fact that you hid it from her then the actual fact you are using steroids.
In my opinion, honesty is always the best policy. Explain to her all the health precautions you are taking. The fact you get blood work done, use proper support supplements on cycle, run proper PCTs etc. She probably won't be thrilled with your decision but she will respect the fact you were honest with her and support your decision.