I miss my boyfriend

My boyfriend and I haven’t spent much time apart before but this morning was the last time we will be seeing each other for the next three weeks. He is in New York for a few days before starting on a cruise where we will barely be able to talk. After he gets off his cruise on the 15th, he immediately flies to Florida for his aunts wedding. The day he gets back from Florida, I leave to go to Branson for 5 days. I already miss him and I am not looking forward to how the rest of these weeks will go. Does anyone have any tips for how to get through this? I know it could be a lot longer but I’m still going to miss him.