Communication is the key

I always say that communication is the key. However, I myself have difficulties with that.
About two weeks ago I unintentionally hurt my partner with a completely lack of tact comment. It was an evening before Yom Kipur (a very important fast in a Jewish religion/tradition, when they fast to atone for their sins during the year), our household is not religious at all, my partner comes from a religious family, but she is not religious at all. Our household were preparing food all together for the next day when all the shops will be closed so we planed ahead everything. My partner said she wouldn't eat anyway because she is fasting... I was so surprised I said the most disrespectful comment "You have no problem using electricity in Shabeth, eat pork, but you are fasting in Yom Kipur?! What's the logic in that?".... I immediately apologized and we didn't talk about it. I just distanced myself a bit from her. Spent more time with my family, partly as an excuse (I could and usually would invite her with me).
Today I finally got enough courage to talk about it. Now I feel so much better. We are good, she's not angry with me at all, and now even better. If we talked earlier things would be even better... no need to distance and sort of avoid the conversation. She even thought for a moment that her showing signs of religion is a turn off for me.... It's not... I just needed to understand the logic behind actions and I acknowledge that my comment was very disrespectful and it made me feel so bad about it for so long before we talked.... we did cry (especially me)... but it made us both feel much better now...

So people. TALK.... it is not always easy but it is important!

PS
This time not anon, it is better this way. Was anon by mistake.