I feel bad.... kind of

Just ended things for the last time with my child’s father. Baby is due in a week and I have been through some shit this pregnancy. He cheated so much, ignored me, neglected my feelings, and just put me last overall. I was crying, stressed, and always fighting (verbally) with his ex that he kept sneaking around with. Arguing with his mom because she didn’t respect me and talked to me any kind of way. It was so much that transpired and it made my first pregnancy hell. At 9 months I’m just now being able to just move on and accept that to be happy I have to get rid of him. Mentally I’m not there and I kindly let him know that me and him are no longer a thing and I would like to remain cordial and only communicate if it pertains to our kid. Before he got off the phone he said “ ok take care and I love you” and I couldn’t say it back. Something wouldn’t allow me to. So My initial reaction was me telling him “yeah, we’re not doing that” as in we’re not gonna do the whole I love you thing before we get off the phone. Granted I do have love for him but I don’t feel the same love was returned or reciprocated. Now all of a sudden he’s saying it because we’re done. Mind you he didn’t say it much at all when I was dealing with him. I can count how many times he’s said it. My question is was I wrong for not saying it back? Does anybody that strictly coparents with their child father end off conversations by saying “I love you” or is it strictly business and that’s it? Cause I’m so new to this idk how to even go about it. But I do know I don’t want him getting any ideas because we will no longer be together. It’ll never happen again