[Trusylver]

You won't build muscle bulk on the calorie intake you are on at the moment, to build muscle size you need to eat a calorie surplus not a calorie deficit. for a normal person you need 1 gram of protein per kg of bodyweight for normal good health. But weight bearing exercise and protein is needed to maintain what you already have.

Just eating protein won't make you bulky

You need that lean muscle to keep your metabolism up. As you loose the fat covering your muscles you will begin to see healthy definition, don't confuse seeing definition with muscle growth.

If you loose weight without maintaining lean muscle first your metabolism slows down so you burn less calories naturally and you slow down your fat loss to the point that it becomes very easy to over eat and gain more fat than you started with. This is what happens with most fast weight loss diets (yo yo dieting)

It is possible to make your exercises harder with a little more variety without weights (just bodyweight) if you want some sugestions.