Reincarnation and the meaning of our existence

Had another great Monday tea time with my son at his grandmas as we played iPad Batman Lego game. We make a great team. I told him I loved him as ever and he said he wanted to live with me one day plus the usual 'I love you more than mum' to which I always say 'don't say that to mum'.
Then I said 'do you say to mum that you love her more than me?' And he said 'no- ill tell her that I don't love you then, to make her feel better'. I said 'don't do that! What if mum then tells dad that you said that you didn't love him?...how would I know you we're joking?'
He replied ' I'll warn you!'
Conniving little so and so and he's only four.

I just heard a song on the radio which evoked a strong memory.
I don't know the artist but its called 'Thats Just The Way It Is (something's will never change)'. I remember one Sunday morning in the 80's I think, listening to Radio 1 as my mum pottered. I was sat at our round dining room table with paper and pen trying to write a story. This song came on and I churned out about three a4 sides as the song inspired a 'feeling' which I'd never genuinely had myself but could understand. It was the same feeling which watching The Wonder Years gave me. (I have now started watching The Wonder Years again and that same feeling of reflection resonates through my bones, except now I reflect on watching it the First time also).
I was born soul searching, that's all I know. Why? Well it's interesting actually. I'm not sure if in doing my ghost/medium work/interviews I have stumbled upon a theory which to me, holds water. Basically, do we have the option to resit life? Life seems to centre around spiritual learning and evolution/progression. Be it through religion or otherwise. We learn, we progress. If we resit earths existence we essentially have our memories wiped but some fragments remain. This can cause déjà vu in some cases or even past life recollection. It feels to me that in my personal case, that would explain a lot.

My life now and especially my inner soul feels so incredibly complete, or should I say, more compete than I ever thought possible,(there's always room for growth). I wish I could share my happiness like a 'happy fairy'- ok bad example. BUT there's only one way from here, down! And god knows life will kick me in the testicles before long.