Boyfriend (26) invited a friend over without me knowing and I thought that the night was going to be just between us

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TL;DR: I will be leaving the country in a couple of days and I was planning on spending quality time with my boyfriend, but he invited his long distance friend to come hang out with us instead. I don't know how I should approach the subject to him because I know that he has been wanting to spend time with his friend, but I feel selfish in wanting to spend time with just him and no one else.

I want to preface this by saying that I will be leaving the country to start graduate school in a couple of days, and I was planning on having one last nice date with my boyfriend before I leave.

I really love my boyfriend's friends, but it really hurt my feelings that he didn't tell me. I now have to scramble to find a time within the next couple of days to spend quality time with him, and I don't think that will happen.

Granted, I should have discussed what our plans were before the friend showed up, but I figured that the night was just going to be between us because we were planning on spending time with my family the next couple of nights before my flight. The remainder of my day was going to be spent packing up and making sure I had everything.

I feel selfish in being upset about this, but I know that I won't have any more quality time with my boyfriend in over a year. We've talked about spending more time together before I left, but I feel like he gets caught up in the present and forgets that I'm leaving. I want to tell him about how I feel, but I don't want it to be the last thing we talk about in person. I don't know what to do.