My best friends fells pressured to become straight?

I was talking to my friend he is gay and he said when he went to his cousin wedding that he felt sad...Knowing that he could never have that feeling w/o feeling guilty. Also he would never be happy being married to a women but says know that he has to so he wouldn't go to hell.. He wants to live right but at the same time wont be happy living a lie..He doesn't want to disappoint his family but at the same time want to live a happy life.His family is going to expecting him to get married in 15 years or so. Is their any advice any gay christians or people for that matter to give him advice for this situations..