They do have one issue; she still loves Shishio.
I recognized Suzume’s irresolute feelings are the one thread for Mazume, Mamura knows that too, that’s why he asked her to stop lying to herself and to go to talk with Shishio and to think it over after that ( but he did not break up with her *wink *wink)
But, while Suzume still feels something for Shishio… Is it love? or a lingering nostalgia?
What about her feelings for Mamura? She never thought that he could make her feel those emotions she only felt with Shishio: jelousy, nervousness, sadness, fear to lose him; but he did. So, are Suzume’s feelings for Shishio still stronger than what she has built with Mamura?
We don’t know, because so far she just has been sweeping those feelings under the carpet, “pretending no to see”. But know that she is going to listen “the words that he couldn’t say” “the feelings she couldn’t accept”, we’ll get an answer.
Hopefully this will happen in next chapter, but given the love of Yamamori Mika for torturing her readers with the streessful love triangle I would not be surprise if she chose to delay the resolution until the very final chapter :P