my best friend got a girlfriend

Just because he's now in a relationship doesn't mean that your friendship necessarily has to evaporate - you only assumed this. If he's worth his salt as a best friend, he'll always have time for you. You just seem jealous (not in the envious sense of the word, as in, you feel your relationship with him is threatened by her). And if you really were his best friend, you would be happy for him and care about his happiness.

It is all too common that good male friends can be "stolen" from us by clingy girlfriends and they become whipped and we never see them. You could try voicing your concerns to him, like an adult, and tell him that you're worried that you to will lose what you had (in the friendship sense), rather than getting into a mood like a child.

Perhaps you still could go on holiday together in April - he should tell her it's Good luck

Have you thought about splurging on some scatter cushions?

How would that help

I don't think I've ever even allowed myself the luxury of developing feelings for my lesbian mates, why did you allow yourself to develop feelings for you best guy friend?

You need to get some perspective and really put this behind you, your friend has always been straight, he likes girls.

I'm sorry I don;t really know what else to offer, but straight or gay, the friend-zone is your own creation, you keep yourself there by clinging to these feelings.

Take some time and distance if you need it but basically properly getting over disappointment about not being liked back is on you.

I've never seen anyone in the friend zone who didn't put themselves there, and maintained it.