so, your ex has your dd for 2 consecutive nights at the mmoment, regularly (sometimes twice a week - midweek and wekends)
he would like to have longer, less interrupted time with her - actually only increasing his contact time with her by a little (7 out of 14, instead of 6 out of 14) - what he seems ot want is more prolonged, less bitty contact.
yuo have said no, because you will miss your dd.
yes, you are being TOTALLY unreasonable, on the facts given here.
I can see why you would say that 8 nights is a big jump up form 2. but you have onths to build up to that, and your ex is asking for longer contact periods anyway.
this is all about you, and not about your dd at all.
your ex has as much right to equal contact as you do. can you imagine if you only ever saw your dd for 2 nights at a time? there is absolutely nothng wrong with him wanting to have ehr for a week.
there is a LOT wrong with you not letting him