so difficult and confused

My partner lately during sex has said things like would I like it if other males were to be involved and if he blindfolded me would I know the difference.. I'm not into it at all and I told him just him is enough to please my needs, I don't need anyone else for that to happen and he said that's okay..

But I went onto he's phone after really weird suspicion with him kinda hiding it from me and he was googling how to get your girlfriend into cockholding and three ways and all this crap..

what do I do, is it just a fantasy of he's or is he doing this so he can have he's way with women I don't understand after me saying no he's still trying?? am I wrong of a girlfriend to feel this way??

we been together for five years and have two kids together