“How’s your day?” is not a come-on. “U r hot” is not hot. Your username includes the words “killer” or “hung.” You copied and pasted your message.
Do not get drunk. You (yes you!) look like an ass when inebriated. Getting wasted is the fastest way for her to lose respect for you.
The appeal of forbidden fruit is undeniable and the temptation to lure an attached person away from their (seemingly) dull and apathetic relationship can be fierce. But proceed with caution, because the side-effects of adultery can be disastrous, especially for the single interloper (that’d be you).