We were living apart, so let’s start my family again is a Manga/Manhwa/Manhua in (English/Raw) language, Adult series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

I met my divorced wife again after several years. Like Takefumi always says to himself, “She’s a stranger now.” Even though his ex-wife, Chitose, has become more attractive than ever. One day when he accidentally goes out for a drink with her, and thinks he wants to spend a little more time with her tonight, he discovers a terrible truth. …My ex-wife now has a child, and it’s mine. A great love comedy that begins after a divorce!