My ex boyfriend opened car door for me and treat me good during reunion, is it weird?

sehungeek
so i have an ex that i dated back then in hs. sometimes he would contacted me or asked my friend how i'm doing right now. sometimes i ignore it and told my friend to not to tell him anything about me. yesterday i went to a reunion and my ex called me, maybe we could went there together and i said okay. i brought my car and picked him up. after we arrived on parking lot, i told him to go in first, so i thought he already went to the building but instead i found him opened the car door for me. actually it's kinda awkward for me, he held the door while smiling so wide and told me to get off. not only that during the event, he kept eyeing me even asked me who i'm talked to when i'm on my phone. am i the only one who find it weird?
My ex boyfriend opened car door for me and treat me good during reunion, is it weird?
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