Help me understand

I was dating this person initially he said he was serious and all so I said yes to him, he was the one that approach me saying he likes me. Now in the 10 months he never really cared for me, was emotionally detached didn't even gave me 5 mins of his day took me to only 1 date, for my birthday all he did was wish me that too late. Initially he was so good and i fell in love with him. I gave him chance thinking something must be going on whenever I tried to communicate he would not ans never shared anything. I tried and tried ,he gave me a statement he will not marry me he will marry the girl his father choose I couldn't understand cause I had asked him before about the same multiple times and he had said his family listens to him. And then last month I gave up I could see he wasn't serious or anything. I told him I can't and he said okay we were friends before let's stay friends so i said him I can't stay friends with you. He replied that how can you do this to me that you won't stay friends with me you have been a really great friend for me. Then went how to give him one month and he will try his 100% then decide. Yesterday I told him about how one of my friends 8 year boyfriend was cheating on her for almost a year and how she is hurt. His reply was she should have not trusted him. According to him it's her fault that she trusted her bf.