I think we would have become friends if we didn't meet there.
"俺らあそこで出会ってなくてもいい友達になってたと思う"
- I think we would have become friends if we didn't meet there.
- Even if we didn't meet there, I think we would have become friends.
もし自分がテニスクラブに入ってなくても、クラスなどで仲良くなっていたと思う
- If I didn't join the tennis club, I think we would have gotten to know each other in class or something.