I really love the middle of this poem. Especially
You snuggle and cuddle and murmur and bubble
Every. Fucking. Day.
which has a really nice rhythm.
The beginning and end don’t really have this kind of lyricism, which is a real shame as I love the idea.

Grammar notes:
In the first life it should be your

I think the first four lines need altering, but otherwise I love the message. Is it a woman scorned?

The tension between the two is palpable. It almost seems the narrator is jealous of the relationship of a friend or a roommate maybe? or an ex? I can totally relate though

I’m conflicted. At first I thought it was someone buried in their work, perhaps not so successfully (I’m trying to write) while their partner (?) goes on their merry way oblivious. Then it occurred to me that perhaps it’s one person whose two sides are warring. The writer anguishes over his (or her) efforts to pour out his soul while the other side of the personality wants to say screw it, let’s play. Either way it was quite riveting.