&gt;I'm so confused on, why NOW? Why does he care all of a sudden? Why is he so obsessed with getting back together after 2 years of wanting everyone but me??? Why say you're sorry NOW??? 

Because often times, we only realise the value of what we had once we lose it.

If the relationship was as toxic as you say and if he actively sought out other women while you were together then I don't think you'll ever have the chance at having a relationship with him where he respects you as a person and as a partner.