Back story as I think it’s relevant.
DP and I are having a tough time.
Together 12 years and have 2 dc aged 5 and 3. I also have a teenage DS from my previous relationship.
DP Mum passed away fairly recently, a little over a year ago, it hit him hard but he’s doing well.
More recently a very close family member had to leave her DP whilst heavily pregnant due to DV.
We’ve been helping her out a lot, she doesn’t have much other support. Helped her get a new place, get settled etc. Her baby has been born with a severe disability, this was completely unexpected and they haven’t left the hospital since the baby was born a few months ago.
We visit whenever we have time, taking her supplies and supporting her as best we can, between us both working FT and dealing with our younger DC etc. She’s not coping well and to be honest, we’re all pretty exhausted. Finding it virtually impossible to get time alone together (so I’m feeling a little insecure possibly? I’m unsure)
Last week a woman we know through DC school brought a gift to our house for the lady in hospital and asked if we’d take it to her.
My teen DS answered the door to her, I was out with friends and she knew that so asked DS if DP was home.
DS went to tell him and said ‘there’s a woman at the door for you’ DP went to the door, said of course we’ll take it, how thoughtful etc.
All normal right?
Except DP keeps going on about it! Telling the ‘story’ to everyone, emphasising the ‘there’s a woman at the door for you’ and implying DS had possibly been suspicious 
Oh how he laughs when he shares this witty tale, adding how lovely, thoughtful and kind she is. It’s got a distinct whiff of mentionitis about it 
I can’t say anything to him about it can I?
Even if he fancies her a bit nothing would come of it, she is indeed wonderful and very very happily married and secure.
I think I should just let him have this little ‘flirtation’ or whatever it is (it’s in his own mind) as he’s been through a lot and it’s not a huge betrayal or anything.
He is embarrassing himself though, and me really. He’s being so blatant, it’s a total non story and he’s getting lots of eyebrows raised and eye rolls while people then answer with a normal ‘oh, how nice of her’
Am I overthinking this and should I just let him carry on or should I say something? I don’t want to cause an argument or to make him feel embarrassed that I’ve noticed.