What do you do if you were me?

I will write a long story very briefly. There is a friend who were used to go to school together even after graduating our friend ship did not ended. We used to be talking a lot and communicating a lot. She lives in England. I live in The Netherlands. As families we had communications.Also during her divorce I gave my support as much I can. Some times when she talk about her problems I had to skip my dinner but I did it from my heart. I visited her in England few times. My divorce was not that much popular one as hers because I kept it silent and short. But she knew that I went through a divorce and she gave me her tips to to over come with the divorce trauma or something as she said.
She never visited me even though she kept saying let me visit you. But she went all over the world. But not by me who is living one flying hour away. Fine I have no hard feelings. I always send her daughter a nice gifts online items. We used to exchange gifts a lot for our kids. If I was seeing some one she knew that too. But she never told me her love life except when she were hurt by some one or when she wanted to vent. But I never questioned her love life even I felt like she is lying to me. Because it is her choice to decide to share with me or not.
But since few weeks she is sending me some wired photos what includes about friendships one said " friendships are like bra straps" " Friendships are hanging slips under the butts" and some other rude stuff such as voice recordings with passing hints and making rude comments about me being on Face Book and she is not trusting those social media at all this and that. But I kept quiet I took it as a joke and I did not bother.
But I realize that she is not responding my whats app messages but I can see that she has been checking her messages. After like 10 times asking she just left a very little message "very busy"
This happened few times and I lost my faith about our friendship at some point. But I kept my self quiet for some time. But it was killing me that she was ignoring me for no reason. So at the end I have decently asked "did I do something wrong? Or did I say something wrong? if so then please let me know instead of being wired. Because your silence gives me bad feeling." For that also no answer.
One of my friend told me may be "better you send a flower bouquet with apologizing card" but if I don't know what is the reason, should I apologize? I mean if I did something wrong that is fine. Honestly I was much hurt and I was trying to think my brain out what went wrong.
Now I am kind of thinking was she using me just to vent?
was there any true friendship at all?
Even if I said something to hurt she should be open about it and let me know. And talk about it and let it our behind. But she seems not possible to understand. Any thoughts? Or any one of you met the same thing?
Thank you for reading.