This girl at the gym.

Maybe trying thinking of her as an actual person instead of an object. She is there to work out just like you.
"She keeps disturbing my focus and made me relapse twise."
uhhh nope. She isn't doing anything to you. Take responsibility for yourself.
"and I do fancy her. Alot."
once again: uhhhhh nope. You don't even know this person, you are just ogling her while she is trying to use the gym and projecting on to her.
Sorry if this comes off harsh, but it's the truth. Women aren't out in public for your entertainment. I guarantee you she couldn't care less that some random creeper at the gym thinks she's "hot". She is just a person going about her business.....

 

Yes sorry, I knew I was being harsh when I posted it, but the way you were writing just had that "I am not really responsible for my own actions" addict type vibe..... There is no possible way to move past any addiction, unless you are truly honest with yourself and realize that you ARE in control of your choices and actions. Goodluck

 

These are all of my fetishes in one post.

 

I like that type of girl too. So I get it. I have relapsed from seeing a chick at work in the parking lot with great calves. Look, just resume your schedule. This is about living your life. We are going to have triggers all the time. Just look at her as a real person if you can, maybe go with your girlfriend and encourage her to work out hard. I had a female fitness/muscle fetish that ruined any natural sex drive with my ex. Please learn from me. Hope I helped some.

 

Coo

Cool. Yeah, bring her along, it sometimes just takes some willpower. I know that is a dirty word but I view willpower as a backup emergency battery pack. When your support system is down, you may just have to go old fashioned strength of the will. May not work every time but it is better than nothing.

 

Just imagine your girlfreind crushed on the hottest bodybuilder in the gym. What actions would you like her to take? And do it yourself.

 

Spoiler: This is a stupid joke.

That is terrible advice. What if OP is a cuckold?

 

Is your girlfriend vanilla or is she more open minded? Maybe if she is open to it, both of you can start chatting with this lady and maybe all of you can roll around together. I think that being honest with your girlfriend is a good idea. What's the point of hiding your attraction to her and later getting caught in a lie or in a more compromising situation? Maybe your girlfriend is hot over some guy and would be willing to trade (as you, you roll around with her and this crush and then you roll around with your girl and her crush.)

Its probably a little unrealistic to assume everyone is open to this sort of thing but you never know. It is 2016...

I guess if she isn't open to it, you can keep on fantasizing about the girl at the gym and just accept that you won't ever be able to pursue her. There are always going to be temptations, especially after you get married.... or if you feel that your bond is not that strong with your current partner, you could break it off and go explore with your crush. You have a lot of different options but I think the first two are probably the best.

Good luck.

Maybe