How do I put my heart back in only 1?

I have feelings for 2 people, or so I think. I love my gf to death but I recently felt something for one of my friends who I used to have an attraction to. I don't know what to think because I think that because I'm not getting much time to see my gf that I might need to feel something somewhere (I'm a feely kinda guy). I think that I need more time but it seems the more I spend thinking of each one the more I see there good sides. it seems that all of the goods outway the other depending if I'm thinking on that one. I know I love an enjoy time with my gf, but this other friends just seems to ignite this invisible fire in my heart and I don't know what to think. help me plz but only if you can, nothing completely stupid plz. this is really depressing me becuz I don't know what to think.