No, not only when you’re mad. And I’m not trying to convince you to recite a sonnet professing your undying love while you’re having a heated argument, that could be suicidal. But, once you’ve argued your case and said what you have to. Once all the angry words have been said. Remind Her that you love Her. If the conversation ended too abruptly for you to fit those words into it (if She hung up on you). Text Her “I LOVE YOU.” Nothing fancy or unwieldy, just a little reminder (for both of you) that the argument is temporary but the love is not.