How is your daughter a priority when he's pressuring you to do something that will be damaging for her?
And it would make you worse off financially.
And potentially put your and her future security at risk?
But then says he doesn't want to marry you. 🤣🤣 Not that I can understand why you'd want to marry him, but what was his reason for this?! Answer presumably is that might benefit you financially at some point, whereas all of his "plans" are about what will benefit him financially at your expense. He sounds like a parasite.
OP seriously, wake up!
Not only is he not respecting your wishes and showing his utter selfishness in that his wants and convenience come above your security and your daughter's wellbeing, but he's making you feel guilty about this and pressuring you even though you've said "no" already. And only two measly years into the relationship which is way too soon to move in together, anyway, if you're being sensible. You still barely know him, aside from the financial disadvantage to you and the impact on your DD if you were to do so.
Of course your answer is no. Presumably he knows about your DD if he spends so much time at your house (which must be hard enough for DD already), so why is he even suggesting this at all?
The only person who would benefit from this is him. That's why.
And probably because you're unwell he thinks you'll be weak and give in and feel like you should be "grateful" to have him around and will put his wants above your and DDs needs. Just no.
Tell him one final time "my answer is no, living together will not work for me". If he still doesn't respect that and drop the conversation then bin him. Although tbh you should be doing that right now anyway.