How can I tell if I have trust issues or if my boyfriend is actually not to be trusted?

That's really what it seems like he is doing, is retaliating against you. He is jealous that you get all of that attention and wants to see how you feel if he does it. For a guy to go out of his way and do that, I wouldn't trust him. You cannot control who chooses to come up to you and compliment you but he's choosing to actually go up to these girls or message these girls to teach you a lesson. It's wrong and childish.
Well it is a double standard. Which is not okay. Though I don't see an immediate issue in your relationship. However I feel it's reasonable to tell him you don't feel comfortable him talking to other girls and having them as friends if you can't do the same for guys. That's a reasonable and valid fact.
The thing I would be concerned about is his reaction and potential retaliation. You are good to address your trust issues and try to resolve them. He sounds like a jealous type and will do nothing but reinforce your tendancy to lose your trust.
Scroll Down to Read Other Opinions
What's Your Opinion? Sign Up Now!if your already thinking that its best to walk away
Are the Instagram pages of almost nude models?
I thought at first he was just following other girls that were his friends. If he is liking and following pages of near nude women, that's just completely disrespectful. When a guy looks at those kind of pictures, it's unlikely that he won't fantasize about those women. I advise you to talk to him about you being uncomfortable of him doing that. Then compliment him by saying what he is doing right in the relationship and how you are battling your own insecurities. Finally, recognize what the boundaries of the relationship are and tell them to him, eg you find it disrespectful that he likes those pictures, etc. Do all that if you are for sure that your relationship with him is worth saving.
Most Helpful Girl