Husbands old flings messaging him on facebook UPDATE

I posted about a few girls who constantly messaged my husband on facebook and sent him nudes. I have his facebook password because he doesnt hide anything and he's barely on facebook anyway but I dont have facebook but he does need his account because of his job (promotion).
Anyways- he always just ignored all that. He didnt delete aaaall girls from his past on facebook because 1. they didnt even had relationships he was just the biggest asshole ever on school and he just had sex with them once or twice and 2. because he doesnt even remember them all.
So there was this girl from our hometown who went to school with him and she constantly sent him friend requests so I accepted one just to look at what she's saying. She said stuff like "wanna have fun like back then" etc but I told my hubby and we just laughed but the next day she sent "him" a nude photo of her with a sad face and said he has a fat wife and could have more fun with her. 
Now the update: I thought what she did was straight up disgusting, not calling me fat (I'm pregnant and had a high risk pregnancy because I weighed too less) but she knows he is married, is the father of two and has a pregnant wife and I just couldnt believe people would really try to sabotage our marriage just because they're thirsty gold diggers.
My husband messaged her back, sending her a picture of me sleeping with the kids around me and he said he's very happy with his "fat wife" and seeing that made me just so happy.
I did feel insecure because of her, I trust him so much and I know he'd never ever lie to me or cheat on me but people like that just make me feel so uncomfortable but I just wanted to take a minute to tell you guys that I feel like I have the most amazing husband ever and I'm sure you guys do too. 
Dont feel bad about yourself because some jealous person who probably has issues with herself says something about you thats not even true. 
I read about so many sad relationships on here and just wanted to share this with you. 
Hope you'll have a wonderful day 😍💘💘💘