Should I say something to my boyfriend?

[star 4 life]

I noticed he follows a lot of girls on Instagram. I'm not sure if he knows them personally but on some of their bio's they say they go to the same University as him. I don't know if i should tell him that i don't like him following a lot of girls or just led it slide and trust him. Hes never done anything behind my back before but i suppose its normal for me to be jealous because i feel that a lot of them are very pretty. Have any of you gone through something like this? and how did you solve it? Im kinda embarrass to tell him about it. I dont want him to think im a stalker. (We have been dating for 6 months)