A relationship is supposed to be a mutually beneficial arrangement with loving and supportive partners. You may love your girlfriend so much but she doesn't replicate the same feelings for you.
A manipulative girlfriend tends to take advantage of you to serve her own needs. Manipulation is a relationship killer since it's emotionally and physically exploitative.
Signs that she has a manipulative behaviour:
1. She likes criticism and accusations
She likes talking about other good guys that enkindle both of you into a conversation aiming a dig at you.
She will take advantage of showing how wrong and weak you are without providing tangible solutions. This shows that she is only taking advantage of you.
2. Lame excuses and trickery
You plan multiple meetings or dates with her and she rarely shows up. This shows she has little feelings for you; she talks to you when bored since you are insignificant.
She meets you when she feels like doing it. She uses trickery for her own good without caring about how you feel.
3. Feigning ignorance
She conceals her behaviour and true character as much as she can. She even pretends to be unaware of things that are going on.
Playing it safe is very effective in hiding any malicious intentions for you. You are being manipulated when she is feigning ignorance.
4. Twisting your emotions
After she makes a certain mistake, she will play with your emotions to prove and make you doubt whether she actually did it.
She makes you emotional where you may end up apologising for her own mistakes though you were innocent. She is taking advantage of you!
5. Being self-centred
She uses the little that you have for her own benefit. She is indifferent to your problems; by making you perceive them as being minute and insignificant instead of helping you find amicable solutions.