The first step is to find out what ails the house. If the house is T-shaped and the main building is located towards the south-east direction of the plot, it causes division of good energies that may lead the spouse to look beyond for satisfaction. Since, it may not be possible to make structural changes to this kind of a house, you can neutralize it by hanging a mirror at the junctions of the 'Ts'.
Vaastu Shastra suggests the placement of lampshades with soft or pastel coloured lighting in the South West direction of the bedroom in order to rejuvenate the flagging love life. Spreading pink or light colored sheets with flowery designs on it are good for people looking forward to marriage.
Mirrors directly facing the bed in the bedroom is the main cause of marriages getting crowded. Such a mirror encourages infidelity. And the larger the mirror, the more harmful it is to marriage! So, get rid of all such mirrors.
It is well known that water bodies, like ponds, fountains, swimming pools, and the like should always be located according to the principles of Vastu. If they are wrongly placed, men folk of the house are likely to develop a roving eye that can lead to infidelity. So, ensure that the water bodies are always located in the north-east of the house.
Unfaithfulness may also be caused by a depression in the ground towards the west. This exposes the spouse to excessive negative energies that work against marriage. You must fill up this depression. For example, if you have a basement constructed in the west, it is best to fill it up. If this is not possible, then hang a brass bell there. Its vibrations will help counter the effect of negative energies.
Make sure that North East corner of the room is not cluttered in any way. Indoor plants, white flowers in the North corner and purple or red roses in the South West corner helps in improving the relationship and enjoying the ecstasies of love.
Feeling lack of romance in your life? Check for the clutter in the house. The clutter energy blocks the positive vibration and thus lacks love & happiness. Thus, "de-cluttering" is the mool mantra.