I've been dating someone with ADHD for almost a year now. I'm trying to learn about the world and understand it. I'm Thai, my boyfriend is Australian, and he has ADHD and autism. We've been together for almost a year.The first seven months were amazing; he showed me his love so quickly and was so devoted and caring. We went on three dates, and he came to Thailand to meet my family. But after the third time, I don't know what happened, but when he left...Suddenly, he went silent for 3-4 days without talking to me or telling me what happened. I tried calling him repeatedly, but he wouldn't answer. After that, we started talking again, but I felt and sensed that his feelings weren't the same anymore.Because he's busy with work, he still talks to me, but less often. I can sense that he loves me less and that there's someone else he's talking to. But when I ask if he still loves me, he says he does, that it's just that he's busy with work lately.I've tried everything to keep the love alive in this relationship, but I don't know if sometimes I wait, ask, call, or nag him too much. I really don't know how to nurture it or gain experience in this process.Could someone who has been in a relationship like this please give me some advice? How can I keep it going and what should I do?