If you are trying to be in a relationship with someone

they want your company and undivided attention but do not want to get married and have not got a spec of libido and make you feel like anything beyond a kiss and hug is an unwelcome advance then what do you do? It's very frustrating. I've tried talking to her about it but ended up feeling like it was my problem. At some point I'm afraid I'll just say "I've had it" and go into complete isolation for the rest of my life. What's wrong with sharing / showing affection and touching?