I am with a guy faithfully about 2 years and half now. I met him on dating Website and I was new on that dating thing. I didn't aware of he was there for years and have had always 'dating' ongoing then. A year ago I found out he lied to me and had with a woman closely for about 6 months. He invited her to visited his family and went out for camping, outings. They broke up last year because his sexual dysfunctional that she couldn't put up with according the woman saying.

I put up with sexual dysfunctional and pretend I was satisfied each time we had intimacy. He didn't put much effort with me, I care about him more he cares about me, but he enjoy sex with me. Many times we seem broke up but still we talk to each other on msn and get together for sex... he knows I want more ever since beginning, he lied to me while he was seeing other women from dating websites. Nowadays he seems inactive on dating websites but I don't know he would ever go on websites again later.

I don't know what to do now, I obviously care so much about him, and fond of him. I am stuck here... up today he is still reluctatnt to introduce me to his family or friends, he is just using me for sex? He knows my intentions for having a relationship and not for sex.

Doesn't sound like the relationship thing is to your liking, so you part ways with him, and seek your own happiness.

You already answered your own question. How long can you continue in your current relationship not getting anything out of it?