I have been with my boyfriend for three years and ...

100lbs in the past year is just unacceptable! Of course you lost interest in having sex with him, he totally stopped taking care of himself. I am sure you love him and care deeply for him, but he needs to get his act together for you two to have a normal sex life again. Talk to him about it. Tell him you care about him and by him gaining so much weight (100lbs is really unhealthy to gain) you are worried about his health. After he gets on top of that, getting on top of you will be much easier and more fun! Mix things up a bit. Role-play, or try using sex toys. By rekindling the flame in an old relationship you are giving it a new and exciting twist. Have sex in an elevator, be risky! Show up at his front door with nothing but black panties and see the reaction you get (I am willing to bet it will be a positive one).

It looks like you have discovered in 3 years that he is now not the same person you met. Three years is enough time for a person to show you who they really are. Have you tried talking to him about intimacy and his weight? Some guys get comfortable in their relationship and end up taking their partner for granted. Honor and respect can not be expressed without an amount of sensitivity toward a partner that results in knowing what that partner needs, expects and deserves. This could be a big lesson for him to learn. Maybe you should talk to him openly and honestly. Some guys just dont know unless you tell them.

You have a real serious situation here, however, attempting to get your fella to understand any of the problems you revealed is just as easy as it would be trying to convince a drug addict they need help. You need more help beyond someone like me who would give him an ultimatum, me or a gym under the guidance of a personal trainer for as long as it takes. Good Luck.

Do you have any influence on his feeding habits?

Read about food to reduce weight.

Talk to him bout his weght and be honest, be apart of his effort to loose his weight and in the process when you see him making an effort you make yours and surprise him in sexy ways periodically, and it will rekendal the romance. Good luck!