Is it wrong to still have feelings and be In love with your ex, even though it's been a few months since you guys have spoken to one another ?

Nope not at all as matter of fact in most divorce cases it takes a spouse an average of two years to move beyond all lingering feelings and move on without regret or guilt so what you're experiencing is quite normal but don't hurry it or you'll be "rebounding" on your feelings and will jump at any person out here so be patient and one day you'll move on