His ex still contacting him?😕

My bf has an ex he dated 10 years ago they been on and off having sex ever since up untill a year ago . She claimed they were friends first and she’s not going anywhere . He said and did nothing . I finally put my foot down and said he could have her then and left him . 2 months later we got back together. He started posting me. He blocked all his ex’s on messanger. And showed me a txt where he sent her saying she’s going to have to respect our relationship and stop contacting him . It’s been a month in and Lastnight we was drinking and he’s like “babe is it bad I troll my ex’s. Post things and like their things to see what they do knowing they’re blocked and have to come to my page and see you took their spot ?” I just laughed but really I thought why is he trolling them possibly sending out the wrong messages that he still notices them . So today his ex that said she wasn’t going any where sat there and commented on everything he post today and he replied . (3 post total) So I txt him asking if she contacted him and he says she txt him the day after he cut her off to say her sister lost her baby and I’m like see desperate. I’m sure she’s contacted u and he’s Like no not since then but I don’t believe him . Not because I think he’d lie but because why else would she think it’s ok to comment on his page and not off the page ? He says she’s just trying to get attention and don’t let it get to me and I told him it’s cuz he’s trolling first .

Why would he do all that to get me back and go right back to how he lost me?

Do you think she’s contacted him off of social media ? Her phone number isn’t blocked he says .