I need to clarify this! help

I need advice
Well I met someone great and very handsome but the truth is man and good ..
I have a girlfriend and I love her
But my life is strenuous because I studied in u and I have a part time job and on Saturdays I gave community help in a teen care center with social deviations, psychology study I still have three semesters, so I do not have a degree but I give my practices in that room ..
In short, he clarified that I am not gay, that's what I think, but I love that boy, he also serves in the place I told you before.
Well he's openly gay and they're smart I admire him a lot
Well he insinuates me constantly and the truth is fun to be near him and when not, we write and it is here when I get gay and I follow the flow and I feel sincerdo makes my life a bit light but not neglected my responsibilities ..
He is perfect but my girlfriend is too and well at least she does not suspect this or that I think but I do not imagine if she would find out I would not forgive her for hurting her and I would not want to imagine
Look at a part of me that tells me that this is wrong that it should not be ..
But I like and fantasize With you already know that ..
And then I want to clarify my conflict even though he knows that I have a girlfriend and still does not care ...
Believe me I do not know what to do, I'm overwhelmed, I do not decide, please help me ...