Looking for ongoing romance manga that is frequently updated
No shoujo/yuri/yaoi/shoujo ai/shounen ai
A nice happy romance that is ongoing
For e.g. Something like Horimiya
No ntr or anything or tragedies 😀

There's:

The Origin of Love
Wotaku ni Koi wa Muzukashii

And one that's not ongoing but fits very well:

Ninja Shinobu-chan no Junjou (Definitely give it a try, it's adorable.)

Must Read Webcomic:
Unsounded

Lists:
Reading
Complete
Western Webcomics

Hajimete no Gal

Gal Gohan

Wotaku ni Koi wa Muzukashii

Saotome-Senshu, Hitakakusu

Karakai Jouzu no Takagi-san

Minamoto-kun Monogatari

Baby Steps - Mainly sports, but has a pretty good romance between the male and female leads.

Most of these are comedies:
Kaguya-sama wa Kokurasetai - Tensai-tachi no Renai Zunousen
Hoankan Evans no Uso
Komi-san wa Komyushou Desu.
Aharen-san wa Hakarenai
Hoshino, Me o Tsubutte.

I'll throw Bokura wa Minna Kawaisou, Renai Lab and Tsurezure Children in the mix

My current top 3:
Fullmetal Alchemist
Pandora Hearts
3-gatsu no Lion