I wasn't sure I was going to respond since this was directed to the ladies, but whatever. You want advice and I've got it. Ignore it if you want.
Look, from what you've posted, you've had a bunch of arguments with this woman. The last thing you posted was about how a friend of her's hit on her after you guys had an argument and there was drama that she felt she was cheating (which she wasn't, since his actions weren't her fault.) Prior to that, if I recall, you posted asking about if you had kids with this woman, whether they'd look more like her because you think she's prettier than you. And now you're saying that you told her you thought sex was boring because it always happens at the same time, so you sent her flowers with a card that doesn't address what you did and specifically says you couldn't figure out what to say, even though you took the time to make sure it had a rhyme scheme.
I don't know you and I don't know your relationship. But everything you've posted makes it seem like you're really, really, really attached to this woman. Clingy and dependently attached. If she's threatening a breakup just to shut you up, then she's either emotionally abusive, or you are incredibly clingy. I'm going to assume the second because of the above topics and the fact that even now, you're not talking about changing anything. You're just saying what a horrible boyfriend you are and creating more emotional drama that doesn't solve anything. As for her getting drunk, Katie's right. That's her choice. But also, you're making it sound like she has a problem, like she was in the pits of despair and drowning it in alcohol. Was that really the case? Or is it that she was just out with friends, getting some space, and she happened to drink? Does she normally not drink? Do you not like her to drink? Is she in her early 20's when drinking is kind of the thing that people do with their friends? There's a lot of circumstantial information that's needed to differentiate whether she was drinking to excess, or she just wanted space and went out drinking with her friends. Either way, you don't make anyone do anything. She lives her own life, and if she wants to drink, that's her choice.
In all honesty, I think you've got to figure out what you want out of this relationship. Do you even want her, or do you just want to be in a relationship to keep the loneliness at bay? Is the sex actually boring or does it just lack spontaneity? Or do you have a different sex drive than she does? Some people legitimately don't want that much sex at all (personally, I really don't get that, but apparently low sex drives do exist. Incredible!) There's a lot of missing information here, but from what you've posted here and in the past, you're pretty dependent on this relationship and your apologies to her seem to just be cries for her not to leave you, pointing to clinginess. So like I said, get yourself figured out. Maybe give each other some space for a while and then come back later.
Anyway, that's my non-lady advice. Take it or leave it.