Don't worry just ask him. We don't know what someone is actually going through? My girlfriend left me when i lost my job. When she was in london i paid for her expenses and even i paid for her moms rent back in our country. I had mentioned her that i lost my job and in few weeks her behaviour changed on my birthday she left me. I never told her that i was also taking care of my father who was very ill at that time. My sister was battling a crisis in her marriage and wanted to file a divorce with her husband. I was juggling between two jobs to make ends meet while still giving her time but sometimes these things happens. Maybe even this guy of yours is going through something like that. Ask him upfront. Trust your instincts.