Crushing

So I have 2 boyfs (and of late, neither relationship has been going well), and now I appear to be crushing on my gp. He is off-limits due to being in a bit of strife in the last few years with inappropriately touching female patients. He has started flirting with me, and I must admit to flirting back with him. Why does my heart have to be so stupid, given I know about his recent past and I am already taken¿ It is like I can't stop myself from falling in love, or even lusting over guys.