How is your relationship with Hakodosh Baruch Hu?

My Rabbi often talks about our relationships with HKBH. I once asked him what exactly he meant by that, but I didn't get much of a response. Whether God exists or not, and if He does exist, what exactly is He, are questions that no one really knows the answer to. As far as I know, even the biggest Chareidim don't claim that God speaks to them, and anyone who does claim that is nowadays considered a fraud or crazy.

So how can you have a relationship with someone or Something that you can't see or hear?

Of course according to Rationalist Jews this is a great example of Nishtaneh Hatevah, unlike worms or lice where it is apparently ludicrous to believe that lice used to spontaneously generate, but now they don't. Or likewise, believing that Rabbis used to have the spiritual power to kill people with their eyes, but now they don't, is completely absurd. However positing that people used to hear God, but now they don't, why, that's perfectly normal! Anyways, I digress.

So, considering we all agree that no one actually hears God, or sees God, what kind of relationship are we having exactly?

I mean, if I told you I had a relationship with the Queen of England (or Britney Spears), because I sent her letters regularly, would you agree? So maybe you'll argue that's different, because the Queen probably isn't reading my letters, whereas HKBH hears all. OK, so let's say I leave voicemails for someone and I know they hear them, but they never actually respond or pick up the phone. Is that a "relationship"?

Seems to me, especially following the Rambam, that none of our simplistic conceptions of God are remotely true, and that whatever image we have in our mind of God is simply wrong. Likewise, whatever relationship we think we have with God, is simply a fantasy in our mind - whether or not God actually exists. In fact, even if God is actually an old man in the sky with a big white beard and Chareidi leanings, our relationship with Him is still just a fantasy in our minds.

Psychologically speaking, everyone has an inner voice, or a "superego", that we imagine talking to, or talking to us. It's just a normal feature of humanity. This same feature is no doubt the cause of the Christians intense belief that Jesus is in his heart, or the Moslems thoughts about Allah.

Again, God may be 100% real, but that doesn't justify calling your rich inner fantasy life a "relationship".

So maybe I'm being too literal. Maybe all this "relationship" talk is just a new age fad, borne from the 60s, and it doesn't actually mean anything other than belief in God. Or maybe it comes from Martin Buber's I and Though philosophy?

Do any acharonim talk about relationships with God? Presumably there's some Chassidic thought in a similar vein, but I would be interested to know if they talk about a relationship.

Does your Rabbi talk about relationships with God?