你想知道我跟你为什么很高兴吗？

I tried to say "Do you want to know why I'm happy with you?" but I think there's a mistake somewhere, even though I can't spot it. Can anyone help?

Question

你想知道我跟你为什么很高兴吗？

I tried to say "Do you want to know why I'm happy with you?" but I think there's a mistake somewhere, even though I can't spot it. Can anyone help?

Answer

你想知道为什么我跟你在一起很快乐吗？

“高兴”是一种心情描述，“快乐”是状态描述。

Answer

你想知道我跟你 在一起 为什么很高兴吗？
I added 在一起 to make it more clear as just "我跟你" isn't specific enough.

Answer

“你想知道为什么我跟你在一起的时候这么高兴吗？”
我跟你only means me and you, so you need to add '在一起的时候'
furthermore, we usually use '很' in declarative sentences, you need to replace that with 这么， meaning 'like this'.