What did he think about me

I have a friend but we are not actually boy friend and girl friend. He told I am his very good friend and he has nothing to hide to me . He talked me about all thing even his sexual expectation . Everyday he called me over phone and gave attention than other to me. Sometimes he said sweet words, such as he likes my smiling face all time . But after meeting his new girlfriend he stop talking with me . He called me over phone before one day ago he meet his girlfriend.Within one day he is totally changed . He don't do any contact with me. I am really shocked in his attitude because I believe that a true friend don't forget his friend after getting girlfriend. Now my question what did he think about me before ? and now he his going to marry his girlfriend and he invites me in his marriage ceremony. Do I attend his marriage ceremony?

Well from what you mention it looks like he was trying his chances with you but it didn't work out. He met another girl of his choice and moved on with her. You need to accept this reality, take him off your mind and just get on with your life. As for attending the marriage...thats your wish. You can attend the marriage to prove you are a casual friend or you can skip it to show resentment.