Why i keep getting ear infections?

Eustachian tube : Lot's of possible reasons, but one of the most common is a blocked "eustachian tube" which allows for drainage of the middle ear. If the middle ear can't drain naturally then infections tend to recur. Seasonal allergies, the common cold, and anatomical variants can all cause a blocked eustachian tube. An ENT doctor would be a good place to start.

Eustachain tube: dysfunction can be a reason. The middle ear space, behind the eardrum, drains through the eustachain which allows easy flow of material out of the middle ear. If this is blocked or does not work well then material stays in that space long enough to get infected. Another possibility is incompletely treated infection of the mastoid air cells. These are small sinus structures just behind the earsIt is hard to get antibiotics into these spaces and they can be partially treated with your antibiotic only to flare up again when it is finished. Please see an ENT doctor.