If a guy is "into you" he will not only tell you so but he will show you! Any woman who has to "guess" "look for signs" or "decode clues" in his language or behavior is probably with a guy who is not "all in" at this point. Love isn't a riddle or "puzzle" to figure out. Spending time together and communication is key.
Having said that it's also possible he will never express love (the way) she wants or needs it done in order for (her) to "feel loved".
There are other men who are great at romantic gestures such as planning surprises, giving gifts, beautiful flowers, balloons, and fine dining while all the while seeing other women on the side. Ultimately it comes down to (your)feelings about him.
More often than not people see what (they) want to see.
With age, wisdom, and experience we learn to choose mates who offer us what (we) want or believe "pure love" to be.
Only (you) will know if you're getting what you want/need.