That scene should only be a big problem if you still have feelings for one or other or both of them. If one doesn't, who cares what they do and when. If you still harbor feelings for them, however, "being friends" is actually the
worst option. Cutting ties or "going for more" and trying to get them both or try to break them up
are better options in that case, otherwise you'll be in a Ross (from Friends) situation and just be stuck doing shitty errands/favors for them while:
Ross has to because he has a kid with one of them, MC has only known Maya for two weeks.