Boy's father not agreeing for marriage how can we marry

Hi, My age 23 I have loved someone and he loves me so much. Now our love matter relieved in his family, his Father seen some of my pics of ours and he don't agreed to my marriage. He told my mother to told ur father to stay away from my son it's better to both families. We have physical relationship, we used safty. If there any way to proove we have relationship? Really distribud in this matter, what will happen if I comited sucide with my bf name and his father with the explanation of present situation on sucide note? Thanks.