what is going on with my curls

ok so i co wash my hair and if i do nothing with it my hair gets extremely tangled and wide and i am forced to water rinse it in order to comb it but if i do a bantu knot out or twist out as the week progress my hair seems to lose its curl and becomes straighter n straighter til my next co wash. and i have really curly hair as you can see below. ive been a natural all my life sooo......is this heat damage?
" Life is what you make of it"
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www.xo-weekendluxury.blogspot.com
thank you im going to try that because i havent deep conditioned in 2 months