AITAH for my reaction to the tattoo my boyfriend of 7 months got for me

so… my name is luna.
my boyfriend is a huge romantic, which i love. we’ve talked about marriage and i do want to spend the rest of my life with him, but that’s besides the point. he surprised me with a giant back tattoo of the moon and my zodiac sign constellation. he has never been very impulsive i’m shocked to say the least. i was speechless when he showed me. he asked me if i liked it and i asked why the fuck he would do that and what in the world compelled him to do something so impulsive and ridiculous. he said he knows he will be with me forever how much he loves me. he was very upset at my reaction and said he was excited to surprise me with something he thought i would like. that’s all fine and dandy but i was more annoyed he wouldn’t even tell me about this idea before doing it? it is very sweet and i’m glad he didn’t get my name at least, but i would prefer he didn’t get anything, or at least not something that takes up half his back? he only has one other tattoo. i do really love him and i don’t want this to come across like i don’t appreciate the gesture or that i don’t see us being together forever, because i do want to spend our lives together. but what the fuck? AITAH for reacting that way and for how i feel about it?