I recently came back from holiday in Portugal. While I was there, I met this guy and we spent a few very nice days together (he planned out entire day-dates and meals, etc.). He was really lovely and we slept together a few times as I thought 'why not' due to the fact there was no commitment involved in the relationship. On our last date (the day I had to fly home) he told me he wanted me to come back soon to visit him and that he wanted to look into visiting me in London (where I live). He repeated this on quite a few occasions, which made me believe he was serious about prolonging a relationship with me as he had made it clear he was attracted to me emotionally and physically. He messaged me later on to see if I'd got home okay and reiterated that I should revisit him and I replied. However, I haven't heard from him since being back in the UK. I feel confused and and a bit upset about this. I don't think he's being malicious, but I don't understand why he'd emphasise wanting to visit me and me revisit him if he's 'all of a sudden' no longer interested. Any thoughts?