If it is an arranged marriage, then there are two directions you could go. One of them is a conflictual relationship, with for example one of them hating this marriage because they love someone else. The marriage starts as a facade, but as they grow and experience hardship together, they grow to appreciate each other.
Another option (more historically common), is to have them both work together to make this marriage work. Love is not something you can force, but that does not mean that it cannot be cultivated. They don't love each other, but they will be spending their lives together, so they must each do their best to act as the best husband/wife they can. Even if at first they do it to have a peaceful life, instead of exhaustion themselves fighting each other, over time their relationship will deepen, and they might truly fall in love.
The last option is to have them simply never truly fall in love. They keep outwards appearances of a married couple, but in truth they barely interact, content to let the other have his own private life on the side, with for example a mistress. This can be non confrontational, and they can even appreciate each other as friends, but they have decided this marriage is only a facade.