BF went on vacation and haven’t heard from him since

My bf who is relatively older than me went on vacation to Rome with his daughter. That’s what he told me and I trust him. He is Italian but lives abroad. We last talked via text four days ago and he was telling me he landed but it was late in the night so we didn’t chat much. He had mentioned being occupied while at it but he would check in me often and I believed so but now four days later not a single text or check in. I’m trying to be cool with it and let him have his fun by keeping myself busy and it has worked but I am missing him extra tonight and it’s making me wonder how comfortable he is without taking to his ‘lover’ for days. I’m not planning on throwing a tantrum or anything like that.. I’m just questioning his feelings now.