How often should you and your partner exchange “I love you”s

I’ll send my boyfriend a goodnight next almost every night, and every night I say I love you... tonight I sent it to him before he fell asleep and he didn’t say it back... it’s it immature of me that I’m a little upset that he hasn’t said it back... like he hasn’t said it in a while and I’m know he loves me (although atm I’m having doubts... I’m probably just scared and insecure but still) but I kinda need the reassurance

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