Responses
Sounds awfully like the hana series.
1. http://www.mangago.me/read-manga/hana_no_mizo_shiru/
2. (Sequel) http://www.mangago.me/read-manga/hana_no_migoro_ni/
3. (Professor & Gramp love story) http://www.mangago.me/read-manga/hana_no_miyako_de/
Thank you guys, that's it
It's a yaoi where pair of childhood friends are in love but one of them is rich and has to get married and the other marrys as well, then in the future, our time, in a another Manga I think, the not rich one is and old professor in a college where his grandson and his friends grandson fall in love and get together