I (31F) have been in a relationship with my lovely boyfriend G (39M) for about 5 months. This is my first ever romantic relationship (I was quite the late bloomer!) and so I feel like I am not sure of some of the norms of navigating a relationship with someone and would appreciate a sanity check. Things are generally great - he's really supportive, I love spending time with him, our intimacy is great...but lately, there's been things he's said that have been irritating me. It's nothing that I think is inherently bad, but he sometimes uses slightly silly, child-like phrases and sing song and it irritates the hell out of me and to be honest turns me off. I've always been someone with a very low bar for cringiness in general (definitely not just with him). I sense that he's letting more of this part of him show because he feels more comfortable around me, compared to the more measured, serious persona I saw when we first started dating, which makes me feel awful that I really dislike it. I have been trying not to let any of my discomfort around this show but I don't know if that's a sustainable strategy long term.
I'd appreciate advice - is petty irritation something that one just learns to live with as part and parcel of being in a relationship with a complex person, or is it better to ask him to adjust his behaviour? If the latter, any strategies for approaching it with him?