What is that movie where the mother finds this guy online for daughter and two timing with single dad musician?

You're probably thinking of the movie "The Lovebirds" (2020), which stars Issa Rae and Kumail Nanjiani as a couple who accidentally witnesses a murder and become the prime suspects. While on the run, they meet a charismatic musician named Keith (Paul Sparks), who is a single father and musician. The main character begins to develop a crush on Keith, but learns he is two timing with a single mom named Becca.