Worried boyfriend will leave me for other girls, help?

We have been in a relationship for a year. So far everything is good but I get insecure he will leave me for girls on Instagram. He follows a lot of local, random girls every week. Likes some of their pictures. Some of them follow him back too. I don't know why he does this, I mean they're all attractive girls but he has me? He always says he loves me. Only last night he pulled me over to cuddle and said "I love you so much" yet today I see he has followed another local girl :( how can he love me so? Is he lying to me? :(
Worried boyfriend will leave me for other girls, help?
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