I'm not going to fund my boyfriend's flight
Why won't you pay for his flight?
I can't let him come to here. England is cold, he wouldn't survive here.
That's a pretty funny reason to not pay for his flight but it's not your job to pay for it so that's fine. You shouldn't pay someone else's expenses if you don't want to. I do hope he'll be able to survive the cold so he can come see you one day though.
I just don't want it to be awkward when we see each other for the first time.
I see, so you are really just afraid of meeting your long distance boyfriend and you're using the cold as an excuse?