Unsure and a little worried

So last night around 3am my fiance and I are trying to go to bed, he checks his phone and says that his best friend is outside. He leaves. Comes home around 6am. Say his friend was having a meltdown cause he is lonely but while my fiance was gone he told me to head to bed and that he loved me, he told me he loved me 5 times in a minutes long conversation. When he got home he was all handsy and kept telling me he loves me which isn't really like him, I usually say it first. The whole time he was gone I just felt he was with someone else, not his bestfriend. Would you be worried, I'm pretty insecure and pregnant and hormonal and my fiance has never made me question him before I just think he could do better than me and that one day he will realize that. I've also been cheated on a lot so idk. Sounds fishy doesn't it?

Update... he's been strangely nice and loving the past few days and tonight he left the house at 11 saying his friend was crying, and needed someone to talk to.