Should I just crawl in a hole?

So, here's the thing. Me and my boyfriend have been together for around 2 and a half years and for the past 6 months or so I can literally count on one hand the amount of times we've had sex. we argue like cat and dog but when it's good it's amazing, I hate to say it but he is like my best friend and I do love him but I'm not sure I love him the way I did when I met him and I understand that when you've been with someone a while it's never the same as it was at the start but i feel like we've been together 10+ years. About 2 months ago I started I suppose "liking the look of" other people, specifically women, I've dabbled in sex with women when I was younger and never really thought anything of it but the feeling is getting stronger and stronger and I can't ignore it anymore. There's this one girl in particular I can't get out of my head. I do love my boyfriend but more as a friend and I'm so sure he feels the same, were not romantic at all, we sit and watch Netflix every night, I've put on a stone, he's put on 2, we bought a kitten and we go on holiday in 2 months and I'm utterly lost in this big f***ing mess. Advice is most definitely welcome