Need help please

[albac]

Ok last few days have been terrible since W told me she was seeing someone else. Today she has sent me a message which is first contact since telling me about seeing someone. It's my D birthday this week and she just sent me a message that basically said I know things are bad at the moment but I am having a cake for her birthday and I know she would love it if you would come.

What are people's thoughts on this? I am having my own cake for my D and to me what she's asking is pretending to be a family when right now we are not. I honestly don't even want to step foot in her house. Any feedback appreciated I'm very confused