A new romantic interest will be introduced.

他将有新的对象。

You end one relationship and then you forget about that one and find a new romantic relationship.

你结束了一段关系，然后你忘记了那段关系并找到了新的浪漫关系。

She uses the term " take up with" to describe her mother getting involved in this new romantic relationship.

她用“take up with”这个词来形容她的母亲卷入了这段新的浪漫关系。

Phil thinks that Melissa should get a new romantic partner, someone who is a nice guy who will appreciate her.

Phil 认为 Melissa 应该找一个新的浪漫伴侣， 一个会欣赏她的好人。

Yeah, oh, and speaking of which. According to a recent study out of Oxford University, when someone takes on a new romantic partner, that person loses one or two close friends.

是呀。说到这个，根据牛津大学最近的一项研究，每当一个人有了新的浪漫对象，就会失去一到两个亲密朋友。

It, here, is used a little more broadly, a little more generally, to mean trying to find a woman who will be your new romantic partner.

它，在这里，用得更广泛一点， 更普遍一点，意思是试图找到一个女人， 她将成为你新的浪漫伴侣。

Well, the seven-year itch describes a superstition that a man, after he is married for seven years, will want to get a new romantic partner, perhaps even a new wife.

好吧，七年之痒描述了一个迷信，一个男人在结婚七年后会想要找一个新的浪漫伴侣， 甚至可能是一个新妻子。