Is it transphobic if...

Mary • My beliefs and opinions are constantly evolving
Do you believe it's transphobic if you're not attracted to someone who is trans* and only cis people? For instance, let's say you're a lesbian and your girlfriend tells you that they are now trans, which now makes them your boyfriend. Or if you're straight, your boyfriend says that they're trans, and now they're your girlfriend. Would you stay with them?
I made a post in the past how my friend came out trans to his boyfriend, and his (now ex) boyfriend broke up with him bc he said he wasn't gay, but he still wants to support him and such through his transition. My friend ended up lashing out at him though calling him transphobic, and now the two don't talk. 
To make the question more clear (so that people don't get confused), is it transphobic to only be attracted to cis people? 

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