Guys please.secret admirer sent me flowers, is my boyfriend jealous?girls help too?

I had a bad day and walked out of my job, i was very upset and i sent a text to all my friends and my boyfriend. when i got home i got a flower delivery.i immediately sent my beau a text thanking him. he called me back a few minutes after and said he didn't send them. i still don't know who did nor do i care. i only care about how he feels about it but he's like maybe it was your job or your ex or your dad. it wasn't them, and he seemed really distant- is he getting jealous? is this going to make him insecure? how do men react when they know other men find their women attractive/desireable? does he need reurance?