What do you do when you haven't been a good friend lately...?

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I have a friend that I really care about and lately, I feel like I haven't been there for him as much as I should be. I know that he's been through some things lately but he's never really told me upfront what it was. I keep hearing things from other people about what's going on with him and his family but he hasn't told me much about his challenges even though I told him that he can talk to me anytime. I mean, I know he has the right to tell me if he wants to or not, but the type of friendship we have is different. He'd usually ask me for help if he needed anything. But lately, we've been drifting apart and seeing/talking to each other less. I feel like I've focused more on myself the past few weeks than truly paying attention to what he was going through. I want him to know that I'm always there for him no matter what and I want him to tell me everything he's going through so that I can help him out however I can because I know how hard it is to keep everything to yourself and sometimes, you just have to tell someone about it. Maybe I'm not the right person to help him out all the time, but I want him to know that I'm always here but when I talk to him and tell him this, I feel like he doesn't really understand it. I feel like sometimes he's purposely bottling up things and not telling me certain things. I don't know how I can make it up to him to show him that I truly am always there. I know that he's going through a lot and I can't stand by and watch him go through with it alone. I really want to help him out. I know I haven't been a good friend lately. At least not one that you could rely on for the past few weeks. Before, everything was good, but now, it's just hard because everytime I talk to him, I feel a bad vibe, like something's going on and he's trying to mask the pain and challenges. Sometimes I feel so lost just thinking about him because I want to help him so much but I can't, unless he's willing to let me. What should I do? What would you do in my situation?