Do you truly think before you speak?

Tonight my boyfriend and I were having a “debate” of sorts that started out friendly and sadly as most do turned into something on a “personal” level… Here’s what lead me to my question… We had a generic debate that ended with him stopping to go to the bathroom and I had a smoke. when he came back we just didn’t start the convo up again as if it never happened. Then I get the thought to ask “why do you love me” but as I’m thinking how to approach this, I’m side thinking the way I’ll explain what I mean… What I ment was “why do you love me? And I don’t mean for all the reasons a “boyfriend” should say”. After that thought process passed through I realized “what would I say if he asked that same question of me in the way I intended?” . So I pondered about what my answer would be and decided not to ask because it might get into something more in-depth then I wanted to get. So do you ever really THINK before you speak as I did tonight? If so what, is an example or sitiuation that made you change your mind or or fallow through with your thought? If it’s not too personal for fluther that is.