Need advice and suggestions on a situation with my friend?

[Dave]

Me and my friend (female) are very close, however over the past year our friendship has taken a little down hill slide due to many factors within in both of our lives (nothing we have done to each other) and this is why we haven’t been as close as previous years. Anyway she sent me an invite to her birthday on facebook but didn’t send me the address! I sent her several texts and calls but she never contacted me back. Yet everybody else she invited I presumed went. Fast forward a couple of days and I called her for her actual birthday and wished her happy birthday on facebook and still no reply (liked everyone else congrats except mine). I sent her a detailed message on facebook asking her to please contact me and expressed my feelings to her as a friend and told her I cant fix the problem If I don’t know what I have done and said it will take two of us to make amends. I told her how important she was to me and how many good times we have had together, I also mentioned that at times I thought we would make a good couple (I didn’t confess any love and never have). I was very hostile and didn’t say anything bad about her or the situation. She replied and said I will get back to you soon with a detailed reply… Fast-forward two weeks and I still have no reply! Now she is making me angry and frustrated!

I believe she is seeing her boss - who she works with. She posts a lot of pics of them together and its strange how all of a sudden she has become close to him and all this anger towards me has started around the same time. I told her the last time I saw her, that she was working too much and her job was asking too much of her and told her that her boss was an A hole for doing that to her. (Before I saw how close they had become) She can never confront her problems (this is why im frustrated with her).

What should I do?
Why would she close me out for?
Did my remark make her angry?
Do you think this guy has said bad things about me?
Do you think she will reply?

Im devastated by this Im so disappointed in her for acting like this

[Luis]

The only reason I can imagine her acting this way towards u is because she's maybe met more ppl or like u assumed might be into her boss and hasn't had time for her friendship with u. You seem like a great friend and I think because u care so much about your friendship with her says a lot about u. U have tried almost everything and I think it was a big step expressing ur feelings like that. I don't think her boss has told her anything about u because he doesn't even know u that well and even if he did your friend knows u way better and probably won't even believe him. U have every reason to feel upset with her and I would too. I'm sure she hasn't forgotten about u even though it may seem like it and wait a little more for her to reply, u don't wanna make yourself seem clingy by contacting her too much so I would wait it out a little more. Maybe u can ask some mutual friends if they know what's wrong. I'm srry ur in this position and I hope everything quickly become better.