lets make lemonade out of lemons.
you actually did yourself a big favor. you found out her true colors. she was not in this for 'love' - if she was, after five month, she would have been happy that you said you loved her (YES I finally got him!).
you were pet dog. i don't mean that in a mean way. what i mean is that women can't stand being alone. some women get cats. some women get a dog. and some women get a guy. some women get all three.
these things are there to appease her. she doesn't 'love' them so much as she 'wants' them. big difference.
moreover look at things this way... provided you weren't AFC during the relationship, there is nothign wrong with telling a woman you love her (oh boy, im going to get a lashing for this! hehe).
as the prize, as the take charge person in the relationship, as the one who CAN live without a woman - you SHOULD guide the relationship in whatever direction you want. you wanted to take it up a notch to a 'love' relationship, she didn't, so good riddance.
what was your alternative? waste years of your life with her? wait until she got bored of you and she dumps your ass for another guy?
naw, you escalated it because you wanted things to move forward. she didn't. better you find out now than later.
the whole thing about not telling a woman you love her makes sense initially during a relationship. it also makes sense if you haven't developed a close bond. it also makes sense in the pespective that odds are if she is feeling the same way as you she will beat you to the punch in saying those words.
but all that being said, if you find yourself 'in love' with someone (provided you know what love is and don't view it as some co-dependent AFC bullsh*t like most guys do) - AND provided you still remain strong and independent after saying it (and don't suddenly become give her your balls) - then i don't see what is wrong with saying it.
yes, its better to wait for her to say it as a general rule. but you know something, life isn't forever and time is a commodity. so if that is how you feel and want to accelerate the relationship, i don't see anythign wrong with - provided you are able to cope with teh reality that it make clearly show you that the two of you are not on the same page and its time to go your seperate ways.