Lost desire

What do you when you man seems to have lost desire to be with you? Sexually it like hes not there like hes the dead fish in the bedroom and no longer even tries to please me.. Sex has progressively gotten worse over the past few months.. Hes young (23), he works hes no diabetic or severely overweight , he maybe last a minute and rolls over no fore play no kissing no nothing. I feel horrible he wont talk to me ive been with him 2.5 yrs. Ive tried lingerie ive initiated he can go months without touching me.. I needed to vent i dont know what to do. Because i do love him but i do know what else to do.