Chau –
Please take this one piece of advice from me. Delete them both from your social media’s (facebook, whatsapp, etc). Checking up on them and watching their online offline status’ is only ripping YOU apart. It is simply fueling the story you are creating in your head about them. It is understandable to want to make sense of their situation but I have found in my life that you are much better off to focus on yourself as you cannot make sense or control them.