I think marriage is the best proof of love!! People marry because they want to stay together and spend their lifetime with partner who they love, I think. However, marriage have responsibilities not to break love and change partners because not only it concern themselves but also it does parsons around them, for example, parents, children and so on.
I think sites to meet partners is good if they meet who they feel true love with. If they go it and meet partner they have a good time with, it become a precious appotunity, I think ^^!