In instances of a love triangle where the other person is there just to cause misunderstandings and problems for the other 2. Like you know who's going to end up together in the end, but that 3rd person causes drama and maybe at one point one of the 2 likes the other person, but in the end the main 2 get together.

Preferably it be male (male lead) x female (female lead) x male (other person)

Misunderstandings a plus.
Drama a plus.

Maybe the girl is really close to the guy even though she doesn't like him, but that causes problems anyway.

Maybe the girl becomes conflicted about her feelings, but in the end, she chooses the main guy.

360° Material - She does gain feelings for the other guy, but only because he's super nice to her.

It seems like your generic shoujo... I mean there's so many of this kind I'm surprised you're even asking about it ! (But I know how difficult it is to find a good one since most of them are lame, shallow, cheesy, boring, predictable and annoying).
Recently I've read Kakao 79% and Otonari complex which are great.
Nanohana no kare fits perfectly (even if I'm really not fond of it).
But then again just pick a random shoujo and you'll find this kind of trope for sure.

I've read Kakao and Otonari Complex. I'm waiting to see how Nanohana no Kare ends because if she ends up with her asshole ex, I'm not gonna bother.

Thanks though.

Shiawase Kissa 3-choume
Strobe Edge - definitely
Nakanmon!
Boku no Chikyuu o Mamotte - if you wanted something a bit more complicated (this one's long but an interesting read)