I agree with mayres,
while the pot looks pretty is is really NOT the thing for an Orchid and you have done well to keep it alive in there so long.
Many people get on with Moss as the medium, but it tends to stay wet for a long time. If you are watering once a week it may be too much for moss.
What you want is a clear platic pot with holes in the bottom. If you want a decorative pot outside that you can.
I favour bark as the medium, but make sure you get stuff intended for orchids, this dries quicker than moss and here in the UK I find that watering about once a week is about right in bark.
As already said, get it out that pot and remove any roots which are soft and squidgy or hollow. The good roots are any which are firm, they may be green, yellow, white, tan, or silvery looking (depending on where in the pot they grew and how wet they are).
The next question is how many roots do you have left when that is done?
If it's none then you need to try a rescue technique such as Sphag-n-bag.
Sphag-n-Bag
If you have even one or two good ones of reasonable length then you should pot it back up. You want to be careful to use a pot which is just big enough for the roots you have. If the pot is too big for the roots it can cause more problems.
When you pot it back up it can be helpful to try and position at least one root so you can see it through the pot. You then can use this as a way of monitoring when to water. Don't just water on a set schedule, but water when a green root at the edge of the pot turns silvery/white. If you can't do that, use a wooden stick pushed in to the medium. When you want to check if you should water it, pull out the stick, if the stick feels cold on your cheek or is noticably damp then it's not time to water yet. Push it back in and wait some more.
Anyway the first thing is to asses the roots you have, post some pics of them if you can to get more advise. In my experience you can keep a phal out of the pot for a few days (or even a week or so) if you spray the roots every day (just make sure they dry out between spraying). So take it out that current pot sooner rather than later.