My boyfriend of five months doesn’t say I love you as as often how can I ask him to say it more?

Been with my boyfriend for 5 months when we first met I was sick found out I had to have a hysterectomy and lost my husband 15 months ago he has been amazing

recently he has been under a lot of stress very tired , he hasn’t told me he loves me as often , he used to say it all the time I am a big worrier anyway

how do I ask him to tell me more often without sounding like I am criticising him? Or should I just ask himI have dropped hints but nothing I don’t want to be a nagg

My boyfriend of five months doesn’t say I love you as as often how can I ask him to say it more?
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