Ladies, I need some advice

So my fiancé and I are expecting, and things have... been bizarre. In April I had a miscarriage, and as it was his first he took it extremely hard. He’s the type to grief alone without talking about it, so I too grieved my own way without attempting to include him (after many attempts of talking about it to him and him not reciprocating). This is all fine and dandy, we’ve both moved on. However, there were a couple of big heated arguments between us in regards to a woman he had dated as recently as mid last year. He claims they were “good friends” for 4-5 years, except that they never talk, and he dated her so recently. I for one am extremely uncomfortable with people being friends with exes unless it’s been a long term friendship (with proof) and I know there isn’t anything there. He has a best female friend of many years and I have no issues with that at all.

Anyway. He told this girl, someone I’ve never met, and who he’s already told me isn’t really his friend (he says they’re friends only when it’s convenient to him like this argument), about the miscarriage. It was something I wanted to keep relatively private, obviously, and yet he told her and discussed it with her. Not with me, the one who went through it, but with some ex girlfriend. When I confronted him about it he said that he had helped her through one herself so she could understand. Like, HELLO, what about me?

Anyway. As he had already known my feelings about talking to exes, and agreed they wouldn’t talk, this happened, AND THEN I find out he spoke to her again. She asked if we could all get lunch, and instead of saying no (and explaining my feelings), he said yeah, maybe. WHILE I WAS SITTING RIGHT BESIDE HIM NO LESS). And THEN, i had a good feeling so I checked his phone. He had told this woman about my very sick cat’s go fund me page, and asked her to donate (hadn’t told me he had asked her). Another argument about how he KNOWS it very uncomfortable with it, and does it anyways. And also, what if she HAD donated? And I can see who does? Like, jeez.

Sorry for the rant. That’s the backstory of our only big “arguments”. This leading to the past couple of weeks. I have a pretty good gut instinct, and it’s right 90% of the time. I have had no feeling that he is talking to her or doing anything, but he used to be extremely open about leaving his phone alone when showering, going outside for a vape break, etc... these arguments happened over 2-3 months ago, and the past couple of weeks he has been suddenly very protective of his phone. Sleeping with it, never leaving it out of his site, the works.

So my question for you ladies (and gentlemen too if any), do you think it’s possible he’s hiding something? I’m extremely hormonal this pregnancy so I wanted a second opinion on what you guys/gals would do.

Thank you 💗

PS: sorry for the long rant lol

UPDATE

I’d like to add that since I’ve been pregnant (starting in June) we’ve only have sex 3 times, months apart. He says it’s cuz he lost his libido...