Relationships

Am I falling out of love or is this resentment?

Hey guys, So first, Happy Halloween 🎃
My fiance and I have been together for 6 years. We got engaged two years ago. I haven’t felt happy in the relationship for a few months now and I don’t know if it’s because i am falling out of love or if im bored and resent him. Let me explain; at the beginning of the relationship he was all about liking girls pictures and following bikini girls on instagram. I asked him to stop and he didn’t. Until two years ago he stopped liking girls pictures and following them. I asked him why he did it in the first place and he said he didn’t know what he wanted but now he does so he stopped. I, however, still think about it and imagine that he still does (we don’t follow each other on social media for stalking
purposes) he says no but it’s hard for me to believe him because he lied before. i would ask him if he is still liking, he would say no and when I will stalk, I found that he did. So I feel like he is still doing it. I talk about him doing that for YEARS and I mean YEARS. We stopped going out on dates, we barely talk on the phone and we barely hang out. I’m very unhappy. I also don’t do anything fun through out my days either. I don’t work so I am home 24/7 the only time I leave my house is to go to the gym. I don’t have friends either so I get bored all the time. So I honestly don’t know the relationship is dying because of resentment or if it’s because we are falling out of love.
Am I falling out of love or is this resentment?
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