does anyone have any BL recs where the couple are exes that never really got over each oth...

I’d say give nanoka no kare a try. Just a tad spoiler since it doesn’t fit your description perfectly, but the main girl is trying to get over him and it doesn’t work out that well. Also kinda psychological http://www.mangago.me/read-manga/nanohana_no_kare/

http://www.mangago.me/read-manga/puchitto_hajiketa/
http://www.mangago.me/read-manga/butler/
http://www.mangago.me/read-manga/mr_100_perfect/ (First couple)

http://www.mangago.me/read-manga/escape_journey/
http://www.mangago.me/read-manga/sekaiichi_hatsukoi/
http://www.mangago.me/read-manga/sono_suki_honto/
http://www.mangago.me/read-manga/hatsukoi_no_atosaki/