He went on vacation, I haven't heard from him

Thanks in advance for reading my post! I met a man online back in May. Our first date went well and we met up for a 2nd and 3rd date. Things were progressing nicely, we were getting to know each other and we kissed at the end of the 2nd date. He had mentioned during the 2nd date that he was leaving for a trip to Europe at the end of the month, and he said he would like to see me again before he left. He made plans for a 3rd date during which we walked at a park and had dinner. During the date we were getting more comfortable with each other and we kissed a few more times. He told me he really liked me and would like to see me when he returned. I told him I would like that too, and we ended the date with a warm hug and kiss. He left for his trip a few days later, and he would send me messages and pictures every few days. I really wasn’t expecting constant communication since we had just met and I totally understand that during his vacation he might just want to focus on his trip and all that. I was happy to receivr messages from him and I tried to keep my messages engaging. He continued texting randomly (the time difference also made it harder). It has now been almost a week since I last heard from him and I know he’s back by now because he told me he would be back in the states on the 27th. I might be overthinking it but I had hoped to hear from him by now. If he’s back, I would have loved a message saying hello I’m back, or any sign of life really. I’m probably reading too much into it but I’m wondering what to do. If he wants to reach out should I keep my hopes up, or should I cut my losses and move on?