I'm new to these forums but have been a long time follower. Theres lots of sound advice to be found but I'm just not sure what to do in this situation.

The History
About three years ago I started getting into the game. I dated a number of girls and eventually found my current girlfriend, since then we have been dating for 2 years. We have been quite happy together, with a few ups and downs, ( for the most part me having difficulty turning off the new found me), but the relationship just isnt what it was. I dont see us having a future together but I am looking toward the future in terms of other girls.

The Problem
I know I currently hold high value mainly due to being unobtainable due to my relationship, but when I leave the relationship I lose that status. There have been a few girls who I know where initially attracted to me when I started going out with my current gf, always smiling at me, acting different towards me compared to others, long periods of eye contact, etc. This has continued going on for the majority of the relationship but I havent escalted it at all, in an effort not to tempt myself.

My solutions?
But now I am faced with a dilema, I cut off a lot of my female interests in an effort to be faithful and attentive to my girlfriend, but now that that is coming to an end, do I end the relationship and start from scratch building up my social network? Or do I find a way to subtlely escalate my game with these girls while in a relationship.

P.s. some of these girls know and/or are friends with my current gf.
Any help would be muchly appreciated.