Although I think the Op,s idea is more novel than actual id just like to point out that your talking about love being a force not an emotion. So before anyone could hypothosize about love being the weak force that hold a particles nuclei together you would first have to show that love is a force when currently its not recognized as anything other than an emotion.

Also just for arguments sake lets say it was love that holds particled together. That wouldnt change anything other than just re naming the weak nuclear force love.

And what would that now mean for the emotion of love. That would have to be re-named as well since the new love can not be both. We dont feel the emotion gravity or electromagnetism because they are forces not emotions...right?

I think the nthinking here is that the emotion love is a binding attracting element to our human experience so its a novel thought to thnk that maybe it binds and attracts particles as well. Its really just loose associationon of characteristics but fun to think about.