IMO, she might lost some trust in you. so try IH as other guru here suggested.
Reading your post, I think of several cases she might become this NOT-LIKE-BEFORE.
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Lost of trust: maybe something you have done make her feel this. Try to convince her, and inspire her that you love her this much. (even if you are pretend to do so, try your best)
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No-Fun/Bored: maybe there has not been so much fun being with you/taking with you lately.
Solution: being with her, you need to give her all type of taste of life. Make her happy and laugh out load, make her sad, make her flushed/shy, even making her cry (but not too often).
Do not spend all your love her (60percent i suggest) or put too much pressure of love with her. Give her some personal space, and thinking back for you. For example, 2 days to show that you care for her, love her, then a break of a day (to make her missing you, missing your caring, as she might feel today she is missing these/that thing from you).
Initiate some thing humor or fun. Teasing is a great fun with girl at this age. Try to tease her sometime, then compliment the teasing by praising her.
Do not tell her everything all at once, you need to learn to initiate sentences, and make her inerested, and ask you back what she want to know. This is a great communication skill. If you don do this and speaking blah blah blah alone, she might think ‘‘I AM BORED with all your words, why telling me these?’’
Do care for her, but do NOT go into too personal.
Do not do something again and again. Bored
For asian gals, using these mixes (Thighen then Loosen, care-ignore, tease-praise) would work well from my experience.
Many more to learn in our life!
Think before you do!!!
so sleepy now, I am going to bed now.
See you all tomorrow