没错，be there for sb 是一个固定搭配，意思是“帮助某人”“支持某人”“安慰某人”“和某人站在一起”等（尤指在困难时提供帮助或支持等）。《柯林斯高级英语学习词典》对此的解释是：If someone is there for you, they help and support you, especially when you have problems. 例如：

You know I’ll always be there for you. 你知道我随时都可以帮你。
Despite what happened in the past I want her to know I am there for her. 无论过去发生过什么，我希望她知道，我是支持她的。