Do あなた think Simba is a good and loving mate towards Nala?

Yes, She's his best friend after all. Not even Timon & Pumba could stop them

I believe they make a wonderful pair. :) I mean, they are childhood フレンズ after all and even back when they were フレンズ they'll treat each other with greatness.

Yes I think he loves her very much! He's just not the lovey-dovey type that's all.

Obviously he does, Nala is his mate and queen. He loves her. that's how Kion came along. Simba and Nala known each other most likely when they were infants.

Yes

Yes. They 愛 each other very much. あなた can tell he definitely
trusts her. When she tells him to get to know Kovu, he does.She even hates the idea of him getting hurt. Judging によって the way she acts when he is in danger.
If he wasn't a good and loving mate towards her, Nala would have
not wanted to stay with him. She is very stubborn.

Clearly they are... duh! They always look out for each other.