My gf change her behavior to me and seems something goes wrong. Pls help me.

Hey,
I have a relationship with a girl that lasts 2 year. My gf never was an expressive person but proves her love to me by acts than words.
The last 6 months i must tell that we werent so good and seems that we lost something. The last week i saw that her behavior change over me and she starts being really happy, send me beautiful heart icons in messanger apps and tells me that she loved me and etc. I am really confused cause i wasnt used before in a behavior like that from her and the fact is that i didnt make anything so an act like this to seems logic.
My instinct tells me that something goes wrong and maybe something new start in her life maybe with an another person or i dont know maybe she try to save our relationship, but generally seems to me so strange and when i listen her is like she lie to me.
Why to act like this when the last 2 years never was so expressive and plus without me make anything for making her act like this.
What is your opinion?
Thank you!

So you are worried because she is more loving and expressive of her love? Why is that a bad thing? I will say this, if it changed suddenly and radically, then you are right to be confused and a little bit worried. Sometimes, people can make radical changes like that (even when they seem like good changes on the surface) because they are hiding something. I would suggest not being accusative or paranoid right off the bat, but do at least exercise extra caution and maintain a healthy level of suspicion.

I say that because, honestly, the fact is it could also simply be that she has realized what a great guy she has and has decided she does not want to lose that. Maybe she's realized that she wasn't being appreciative enough and has decided to change that. It could just as easily be for good reasons as it could be for bad reasons, so don't jump to conclusions yet. All the same, you are not wrong to find her sudden change strange, so "cautious optimism" is perhaps a good phrase for the situation. Good luck to you.

Thank you a lot.
I will follow your advice but also i will wait to see if its a real change cause i find a rapidly change like this not so logic.

That is a good point as well. Sometimes when people make radical and sudden changes they don't always stick. If that turns out to be the case, then when she sort of settles back into her "normal" that may tell you more. Good luck to you either way. Hope it works out well for you, whether that means things work out with her, or if it winds up meaning you two break it off and you eventually find somebody else. Either way, I wish you the best.