Am i crazy.or what. How would you act about your girlfriend/boyfriend doing this?

We have been together for a year. In the past 3 months, hes been snapchatting girls and i confronted him about it and he told me they were just friends, so i let it go.until recently about a month ago, i saw that this one girl was his #1 best friend on it, which is above me. We snapchat so much too, so it caught me off guard. I told him i was upset about it and he said he didn't talk to any girls and he would stop snapchatting them. Again, new girls keep popping up in his feed and he likes their pictures on instagram. I caught him lying, and he said he lied and was talking to other girls before, nothing sexual though in his words. I have trust issues with him now.hes told me he would stop snapchatting girls before twice, and continues to. What should i do? We always seem to fight over the same thing and he knows i hate it, says he will stop, but doesn't.

i may sound crazy and overly jealous. But he gets mad at me if i simply reply to one guys snap or text message. What should i do.

and i know you all will say trust is key in a relationship, but i really love him.

last night his points on it were 3, 794 now its 3, 862. Which is a lot of snaps. 2 points to send, 1 point receiving.

also, he was snapchatting this one girl and she was on his top and he said that he only snapchatted her once, but obviously that isn't possible to be on the "bff" list.seems like he is hiding something to me. This happened about two weeks ago.

FOR THOSE WHO DON't KNOW WHAT SNAPCHAT IS:
its basically and app on android and iphones where you send pictures to eachother, it could be anything and they only see it for 10 seconds the most and it disappears.

You are acting stupid who cares if he snapchats other girls get over it and let him do what he wants he is not sextng them so be happy dummy