Do I have a right to be upset?/Am I in the wrong?

I’m trying to make things work out with my ex boyfriend of one year, after little over 2 months of not being together. When we broke up, I noticed he added the girl he was talking to before me on fb, and he didn’t have me on there while we were in a relationship. His excuse was she added him, but they can’t be friends unless he adds her back. Recently a few days ago she also follows him on Instagram and he thinks about following her back but didn’t. The reason why we broke up was cause he wasn’t over his ex from 5 years ago, so seeing another person from the past coming back got me upset. I told him and he tried justifying it saying she had a kid and she’s happy with her bd and they didn’t even date and it was “a fling”. He told me the reason he left her was cause she was living with her boyfriend at the time and he didn’t know about it. Yet he still gives me crap for hanging out with a guy, which was strictly platonic, when we were only seeing each other for a month and weren’t bf/gf. But he forgives someone who was lying to him from the start? I’ve owned up to it too and tried to make him trust me. I told him if he wants to follow her then fine but I’ll be gone cause I don’t want to deal with someone from the past. He decides to follow her and tells me I’m over exaggerating and being controlling cause he can’t add one person then mentions my fb friends (I had around 600) and my likes. 80% of my friends are girls while 20% are guys. It’s usually the same 3-4 guys liking my shared posts (not photos of myself) but he brings up when I update my pfp I get guys liking my stuff and messaging me but I don’t message back nor do I like their stuff. He brings up the little faith I have in him. However, during our relationship, he was always liking girls’ photos and adding them while he never acknowledged mine even when I told him how it made me feel. I recently saw someone on his list with an inappropriate pfp and mentioned I didn’t like that. He tries defending it saying that isn’t their whole fb and maybe they’re an outgoing person, yet he got mad when I said I’ll do the same. He thinks I’m being childish and shouldn’t be upset. Am I over exaggerating?