An unfortunate and inevitable part of depression is hitting rock bottom. It can lead to suicidal thoughts, random crying jags, extreme symptoms and other various symptoms. It can be very difficult to watch and even harder to deal with. It is hard to hear but the best thing to do at that point is to be there for them. Let them come to you, or if they dont seem to be doing it on their own, then go to them and hold them. That will sometimes be exactly what they need. It may induce a crying jag, but that is actually healthy. It gets them to start letting out the negative energy that is building up.

It is also important not to really leave them alone right now. If your significant other is trying to be alone, it could be so that they harm themselves. No matter what they say, it is not a time to let them be alone. They could say many things, including that they no longer love you, that they are breaking up with you, whatever they can say in order to get you to leave.

Let them rely on you, this is one time when the term a shoulder to cry on is less of a metaphor than others. Let them curl up with you and cry. Be a comforting source here. Unfortunately, it is not the best time to let your own emotions out. As hard as it can be, this is a time to be steady for them. After it is over, you can both sit down and talk, but at this point, you need to find a way to just be there for them.