<human>: This is so stupid but...

My friend just got back from a month-long vacation in Argentina with her boyfriend, and has been telling me how she feels shitty about being back in Canada (it's winter and obviously it's cold here). I get the post-vacation blues... but the rest of us had to live through the darkest month of the year and I don't really have any sympathy for her. 

Anyway she wanted to call me this evening and I kind of word vomited that I don't have the emotional energy to talk to her and hear about her amazing vacation and also complain about how shitty it is to be back. The reason is because while she was gone I was pretty depressed, I've been dealing with a lot of shitty emotions since my 4.5 year relationship ended terribly late summer last year and the holidays are a difficult time to be single. Especially when you're reflecting on how you used to spend the holidays etc. Basically it was a hard time and she wasn't here, and I couldn't really talk to her/ask for her support because she was on vacation and I didn't want to burden her with my issues. 

Anyway she's mad at me now and I don't know what to do. I want to tell her that it's been a shitty time for me and that's why I can't just like hear about her great vacation today. I just don't want to be a bummer of a friend, because if I'm being honest if we talk, a lot of what I have to say is not positive about my life and I don't want to add to her post vacation blues.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I expressed my annoyance at my best friend's complaints about being back from a month long vacation with her boyfriend in Argentina, now she's mad/annoyed at me, and I don't know what to do or say.