Yo-yoing between orientations

That very well may be the case. It was for me.

I first identified as bisexual because I couldn't accept myself as gay. But as time went on and as I talked with gay guys and compared feelings, I recognized that I actually didn't have any sexual attraction to women and all of my feelings were for men.

I'm not saying that you're like me, but it's definitely a possibility. A lot of gay people go through an intermediary bisexual phase while they subconsciously process and eventually accept their sexuality.

What really drove it home for me was when I started paying attention to what my eyes followed in public, in porn, in movies, etc.
I found that I always paid attention to guys and pretty much ignored any pretty woman if she was in the presence of a gorgeous guy.

 

I went through a bisexual phase for a couple of years where although I began to realise that I was more attracted to women, I still thought that I was also attracted to men as well. That for me turned out not to be the case, I realised probably just over a year or so ago now that I am not actually attracted to guys at all.

I'm not saying that this is necessarily the case for you but as TJ said it's very common for gays to have an intermediate bisexual phase. You may well be gay, or you may be bi just with a preference for men. It's something that you can't force, in terms of understanding and realising what you like, you just need to give it time, and I know you said you've taken a step back from it, but dating may also be a big help for you in realising what you're attracted to.