I was once a "nice guy" I spent 8 years without pussy because of it, I figured out what I was doing wrong, changed my outlook, and now when I want a woman, I get one.
Thing is, buying stuff for a woman all the time, paying for everything, comes off as you trying to buy her affection, spending should be a 50/50 split if possible.
Also attraction is different for women than it is for men, realizing this and keeping it in mind is essencial.
Men are generally very visually attracted, it's natural for us to find certain things attractive, we don't all like the same things, but we are usually attracted by sight first, then other things.
Women obviously don't have anything against good looks, in fact they can help, but generally there are many many other things going on before they matter, your attitude, your posture and your scent, are far more important than your looks, if you have a confident positive attitude, and stay in control of yourself and your general situation, that goes a loooong way, if you have a decent flexible sense of humour, also helps a lot(same with in any kind of relationship, people like people who know how to be funny or make things funny), if you stand tall and lean back(not towards her) when sitting together, that helps a lot too, and seriously if you smell like ass that is gonna hurt your chances of getting within arms distance of any woman without turning her so far off that it kills 100% of your chances instantly.
Now on the topic of scent, you don't HAVE to wear cologn, in fact most guys wear too much if they wear any so it's a nose violating air impurity rather than a nice smell.
Usually I've found a good cologn helps, but you realy just hafta smell clean, so shower and wash the sweaty bits on your body TWICE, maybe use a good body wash, I've found the old spice odour blocking body wash to have a nice lingering fresh smell, the blue stuff is the best stuff(can't remember the name), also axe body sprays though they are usually totally horrible smelling, essence is a good one if you can find it, it has a relatively mild odour, but it smells nice, and isn't too fruity or weird smelling.
If you do wear cologn, for the love of all things holy unholy or living, please use only a dab, generally dabbing it on your inner wrist then rubbing your wrists together then rubbing those wrists on the sides of your neck is the best way to apply it, after all, that gives you good coverage where a woman is likely to smell you in close, without violating her sense of smell.
Just a few guidelines there, but even following those guidelines, I've gone from wussy bastard with no clue to getting dates/phone numbers with ease, I'm only ever alone by choice, or by freak circumstance, like all the best drinking establishments are closed and all the women i have numbers for are out of town or dead or something... I have yet to experience this, but I will not deny the possibility, because I know as soon as I deny it, it'll happen at the worst time.
Oh, and dental hygene is important beyond mention(which might be why i almost forgot to mention it), taking care of yourself first is a sign of independance and strength, this is importance, women generally don't like a wussy mama's boy or a man child who can't take care of himself.
also important fassion tip, if you wear a belt and are wearing leather shoes, same colour guys, a brown belt with black shoes(ore vise versa) is tacky and uncoordinated looking, women sometimes(hell depending where you live and the female demographic you are looking at, often if not always) notice this kinda thing, so it's a good thing to keep in mind.