so is it okay if he said that to a girl he use to like ?

my boyfriend use to like this girl Monica before he meet me and we started dating that was 3 and half years ago. he asked her out and she said no. then we meet and we have been dating for 3 years. he has done a lot for me to prove that he loves me but. i saw on his phone this text between them on his birthday. she send him(happy birthday you handsome pharaoh lots of hugs to you i miss you so much) then he replied (the beautiful Monica. you know your message is my favorite message out of all messages i have received your so creative you should be a writer more hugs to you) with hearts and winks

so i saw the message and i was so made.

like i also sent him a birthday message so hers is better then mine ?! and beautiful monica is that abororite the way they are both taking to each other when he has a girlfriend. and when i asked his to explain he said i said beautiful because she doesn't feel beautiful about herself so i say that to her to make her feel better and the thing about favorite message im just being nice. does this suppose to make me feel better because i said to him this is bollshit.

am i overreacting or is it not right ?