@depzdai not really, its pretty clear Sumire has always been MC's main girl. He just also likes to see his friends naked/in compromising positions as well.
MC is married to his career/hobby - sorry Sumire, you're precious to him in every way except the way that involves you becoming more important than photography. That's a line he'll never cross, no matter how many tears you shed.
Ending was a bit too abrupt. A few more pages at least would've made the ending feel cleaner and more satisfying. Seems like he's probably getting together with the girl from the start, which is the usual case in these romantic comedies.