<human>: ***Sorry if this is the wrong subreddit, please post me in the right direction if I shouldn't be posting this here.*** 

I have planned a trip to Europe with my two best friends. Last week they have told me they have started seeing each other. I will be travelling to Europe with them for five weeks and now I will be a third wheel. Whats most frustrating is that with one of the friends I told her that I would feel uncomfortable if they did end up dating before we booked any flights and she said that 'it wouldnt happen.'

I am pretty pissed at them as I have planned this trip as three best friends and not a couple and me. Is that justifiable? I know feelings are feelings but am I being unreasonable here that I think it is utter bullshit that they have begun dating even knowing that we have this trip ahead of us? I feel like the bad guy here.

The problem is I feel uncomfortable. I don't want to spend five weeks like that, with a couple. Even if they told me they would stop any PDA around me, it still does not change the idea. I don't want to be around that for the entire trip. But I also don't want to hurt their feelings by separating from them. I have spent a lot of money, this is my trip too and my holiday, I want to enjoy myself.

What should I do? I am incredibly lost for ideas. Should I seperate from them? Any advice would be useful for me.

I am extremely annoyed by this entire situation.

Can you summarize the given text in a few sentences?
<bot>: I have booked a five week trip to Europe with two best mates. Last week I found out the two have begun dating each other. I am entirely uncomfortable by this situation. I don't know what to do!!!