Yes^ I also like to think before I talk. When I'm in a situation where I feel compelled to express my deep feelings, I hold back. In that moment I don't feel anything I say could do justice or convey my feelings (especially in romantic situations). Also I think at times, I'm so focused on 'feeling' those emotions that words just won't come out. Though, if given sufficient time, I can express my emotions in a somewhat eloquent, heartfelt manner. Perhaps it's because I've distanced myself from the intensity of the emotions a bit.
^ Very true, I believe. I would even go so far as to say that expressing ones feelings actually taints these feelings. I've experienced a sense of loss, at times, after expressing my emotions.
I've thought quite a bit lately about whether to say aloud feelings that are very obvious at this point to someone I'm close to. The situations in which these feelings became obvious speak more clearly than if I tried to say the words. Certain responses in certain situations don't lie, especially if the two of you are open, trusting, and allow feelings to show. I thnk that I'm also averse to saying aloud the obvious perhaps because words drain the experience of its power and grace. I sometimes feel I'm a natural mime. :--) I relate to what you say about not being able to express emotions on demand. It's a little frustrating for the other person but I will always go away and think about an interaction before I can come back and talk about it. I have to have time to process.