Potted Japanese Maple (acer)

Potted Japanese Maple (acer)

Hi everyone! I'm new to this community, and pretty new to gardening in general. I have a couple of aloe veras and potted herbs etc, and am planning to do a little in the garden soon as well (although nothing too permanent, i am a student and live in a rented house which 'runs out' in July). But my real question today is about my potted Japanese Maple. Now, this was a birthday present given to me by my now ex-boyfriend (who I still live with! nightmare! but that's a long story for another time.) and has been in his bedroom over the winter because there isn't space in mine. Because of a recent fight I have decided to bring it upstairs onto the landing outside my room where there is a lot of light. He is just growing some of his leaves back after the winter, and my ex was going on about taking him outside again but there is still a frost now and again at night so i am dubious about this. To cut a long post short: what basic things can i do to keep my maple happy? Not only do i love it a lot, I don't want my ex gloating if the tree starts to look sad. I'm planning to put it outside in the next couple of weeks when he has more leaves. Sorry about all the pointless personal crap throughout this post, i hope i'm not making a lousy first impression on the community! Thanks in advance for any advice :)
Can someone tell me what flower this is?

Can someone tell me what flower this is?

Giant Timber Bamboo

Giant Timber Bamboo

My very red bedroom

My very red bedroom

Tomato

Tomato

I can’t wait for maters

I can’t wait for maters

Water plant ID

Water plant ID