My son is thinking a lot, what can I do?

I am 45 and my son is 19. We have a very good relationship, we spend time together all the time, we travel, we do shopping. Dec. In short, we never have communication problems. I think I'm one of my son's closest friends. My son told me 2 years ago that he was gay. At first I was very surprised because there are a lot of girls who like my son, and their behavior, etc., was not like gays. But I didn't say anything, I said maybe he was a little worried about me. I feel like I'm always there for him all the time, but he's been very absent-minded for the last 2-3 months. He is constantly chasing thoughts, constantly drawing pictures, playing drums. And once when I asked what was wrong, she cried and told me that she liked her close boyfriend, but he was constantly confused and straight. I tried to give him advice, but I think I didn't succeed. I also know the person he likes, he stayed at our house 3-4 times. When I asked my son if he didn't have a girlfriend because of these issues until he was 19, he said, "so yes, I've loved 3 men by this time, but they've all treated me very badly or some things haven't turned out the way I wanted." And when I see him like this, I feel very sad, whether I want to or not. What can I do? Once, when I went to her room around 2 or 3 at night, she was crying and pretending to sleep when she saw me coming. Don't fake it, get up, let's talk about what's wrong, and when I said I don't want to talk right now, he said. So I went. I never see him eating, for example, I always take home things he likes, but he doesn't eat. If it used to be, it would all be over in 2-3 days, he doesn't even eat anymore

My son is thinking a lot, what can I do?
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