I think its worth setting out that your options are not 'aro' or 'another bad guy'. If you believe that framing you will probably find yourself siding with aro regardless of whether or not it is an idea that fits you.
Romance is one possible part of a relationship and even people who feel a desire for romance can put that that for other things.
You might be aro but more importantly, the things you have written, aro or not, do not make you a bad person. If the people involved in that relationship you talk about consent to the way that relationship is, understanding what they are involved in, then I don't see what about it would make you a bad person.