Need some advice

I don’t know if I’m making a big deal or it’s bc I’m pregnant but my relationship hasn’t been the same since I got pregnant. I’m 5 months and things aren’t how they used to be . My boyfriend used to be so sweet and used to show me off all the time he used to post us on his social media and just shower me with love . We used to have sex almost every day and now it’s just every 4 days . He doesn’t post me or like my post he doesn’t even post about our baby . He only did once . Maybe I’m just too emotional but this baby is such a big deal for me every time I have an ultrasound I post it and he doesn’t even bother to post it or even like my post . He also been acting weird he takes his phone with him every where. He won’t leave it out his sight . It’s so hard he doesn’t make me happy and I’m just waiting for him to fuck up so I can have an excuse to leave him . Sounds fucked up but I just don’t feel loved .