What causes new paint to peel of the wall

I painted my bedroom with a latex paint 2 months ago, now its peeling off the wall, my question is can too much water added to the paint causes this and what do I need to do to fix it

What was the surface you painted ?

If slick or if it had some finish did you sand it first.

Did you use a good primer on the wall first ?

Suppose you didn't put water paint over oil did you? I don't think too much water would do it. Water would make it thinner and you would probably need an extra coat. Was there heat on while it was drying or is there any dampness where you painted.