Ross Geller has had a lot of relationships over the 10 seasons of বন্ধু (not to mention his 3 divorces). Here's a timeline of all of his girlfriends in the show.
Rachel's dad finds out that Ross got Rachel pregnant, and goes over to Ross apartment to shout at thim, while he's on a তারিখ with Mona. One of the funniest Ross moments (among the MANY more)