Questions about example sentences with, and the definition and usage of "Nexflix"

A: × The round is on me. I have to pay for dinner.
✓ This round is on me. I have to pay for dinner.

× It makes me think a lot of The Earth.
✓ It makes me think a lot about the Earth.

× I think i’m gonna be died by her.
✓ I think I’m gonna be killed by her.

× 2. She’s been wating me for 2 hours.
✓ 2. She’s been waiting for me for 2 hours.

× I’m obsessed with watching ther series “One hundred”.
✓ I’m obsessed with watching this series called “The 100”.

× This is really interesting.
✓ It is really interesting.

Most of it is just nitpicky capitalisation and spelling errors.
Place "called" in front of "The 100" to show that it is the name of the series.
"This" replaced with "It" because you are talking about the show ("This" implies that you are currently close to the show as in watching it).
"died" should be "killed"
"The" replaced with "This" to show that you are going to be close to the round in the future because you are going to pay for it.

A: × 2. I’m eager to seek the man who could be my boyfreind
✓ 2. I want to find a guy who could be my boyfriend

#2 sounds really intense and creepy, it’s correct though

A: ‎Season 2 is not available on Nexflix. So I only keep updated on new episodes on YouTube.

The first sentence is good but it would be more natural to say this in one sentence. “Season 2 is not available on Netflix, so I watch new episodes on YouTube.”