Is my former partner connected to me by some element, something, some energy? Is there a particular constraint that prevents me from unblocking this bond and this relationship?

To answer this question you need to understand that Oneness Is You: All is One. So your former companion is your manifestation. Or rather, in your earthly reality intercepts of individualization called … [n.d.r.: name of the former companion] the version that is consistent and functional to your Path of Expansion.
Is that clear to you?

Yes, it’s clear to me.

So since everything is One, you and he are the same One individualized in two different forms to make an earthly experience of Expansion. You are aware of the individualization you call by your name; he is aware of the individualization he calls by his name. In incarnation you have lost awareness and memory of the Reality of all is One, and in meeting you you have experienced Oneness in the earthly manifestation and separation in the earthly manifestation.
Is that clear to you?

Yes, it is clear.

Now, the energies that allow individualization and separation, and the Union and the new separation, are interconnected with each other since everything is One. What is to be liberated, then, is not interconnectedness, for all is One is not separable, but the illusion of separation is loaded with opposing emotions. For you to understand: what separates and at the same time binds is conflict: freeing your awareness from conflict loosens the knot that keeps you tied to an attitude to Life that is no longer yours.

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Excerpt of a Channeling from the Source session
 of 21.11.2023