What do you do when he doesn't want to have sex anymore?

Sweety, he is either being a jerk or has other plans and they do not include you.

Cool the relationship and consider the masterbation road.

If you want a really neat, but discreet vibrator of your own. Purchase a battery operated cross action toothbrush with ultra soft bristles. Use some KY for lubricant, just a dab. Gently use the brush on your labia and in between moving up to your clit. You can even reach your G spot with it.

Keep it extremely clean and do not let anyone else use it. ever ever ever!

wow hunny im sorri to say but every guy loves sex…if hes not sleeping with you than hes just not that into you…I cnt lie to you and say that mayb hes reele busy..but if I said that it wud just give you hope that hes gunna change and he want…tlk to him tell him to get his things straught because sex is importnant to yew …hope I helped plxz return the favor and answer my most recent question

Contrary to popular belief, it is possible for a guy to not be into sex. Your best bet is to actually talk to a couples therapist. Realize that you said you are supposed to be getting married. Sex is kind of an important thing in marriage, and I think you realize this is effecting the relationship. Before you get married, talk to a couples therapist. There might be more issues than just sex.