HELP! I need advice!

I need to know if any of you other ladies have experienced this. 
I've had that same boyfriend for about 3.5 years, and I've never been with anyone else sexually. But occasionally I feel very sexually attracted to some of my other male friends. Is this normal? I feel guilty, but then again my boyfriend and I haven't been having sex as much as we used to so I wonder if maybe it's just natural? 🙃 I've been finding my self bored or unhappy with our relationship more than I'm happy in it for awhile now. 
-Is this okay?
-Is it wrong?
-Should I talk to my man about this?
-Or does it mean it's time to move on from my current man?