am I overreacting? ig hoes ๐Ÿ™„๐Ÿ˜’

So me & my bf are in a long distance relationship. Recently why looking at his instagram I noticed some girl commented on lots of his pictures.. '๐Ÿ˜' 'mine๐Ÿ˜ฉ๐Ÿ˜', ย  ย  ย  ย  ย  'daddy๐Ÿ‘…๐Ÿ’ฆ' so first instinct was to screenshot & send them to him like 'wtf' he says he don't know her๐Ÿ™„ so now we're in an argument cause instead of explaining he's gonna leave me on read.. says I'm mad at him for something he didn't do..
But how am I supposed to react I could of just went straight to messaging her.. but I tried to talk it out with him first.. how do I handle this?ย 
Should I just message her..๐Ÿ™„