Won’t comment on the physics because I’m an atheist, nota cosmologist or a physicist.
I don’t believe there is a meaning in the Not in the sense usually used by theists. Best I’ve been able to come up with is that the meaning of life is itself. To survive and endlessly replicate in its many forms, not just in the sense of human life. I’m unable to believe we’re special.
When I was 20, I was love and thought I knew all about it. Fortunately for both of us, we did not marry. Since then I’ve been in love twice more and married once. (not to either love)
Today at age 73, I don’t understand love at all. I think the romantic and courtly love of twelfth century Troubadours (earlier in India) and popular music is crock. It’s innately selfish and seems to always have been a means to an end. IE a man getting into a woman’s pants.
Altruistic love? I guess it exists, but I’ve never seen it as far as I know.
Love as a function of reproduction? Absolutely. The urge to reproduce is I think our most powerful instinct after survival.
All I can say from experience is that each of those I have loved had feet of clay. By that I mean I built fantasies which were never capable of becoming real.
So at the end of it, I really have no idea about what love is, although I have some ideas about what it is not.