Since this is a sort of post DH era question I'm going to move it to the book 7 forum.
Personally, I think Lee wouldn't mind either way. He was a friend to both Fred and George and if he had any objections to Gearge marrying Freds girlfriend I think he would have kept it to himself. I don't recall Lee ever openly displaying any affection towards Angelina, so would be interested where you got that from, or am I over looking something?
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did jk rowling tell us that george ended up marrying her
Yes, she did. Recently JKR has released a Weasley Family tree that shows who married who. Anyway,
Here's a link to the thread. The first post contains a link to the family tree.