If you have known each other for a while you may think that your partner has a pretty good idea of what you are thinking and what you need. However your partner is not a mind-reader. While your partner may have some idea, it is much healthier to express your needs directly to avoid any confusion. Your partner may sense something, but it might not be what you need. What’s more, people change, and what you needed and wanted five years ago, for example, may be very different now. Getting in the habit of expressing your needs helps you make it through difficult times, which otherwise may lead misunderstanding and anger.

I have no problem expressing my needs to a Partner, when I have one. I find the problem more to be, he doesn't express his mind.

I see what you're getting at. If a person changes TOO much though, from who they used to be, then sometimes their partner may not like this new person. Sometimes people just aren't their old selves anymore, which can be off-putting to whoever used to like them for who they used to be. I've seen many just turn into monsters and they stay that way.

isn't that called communicating?