<human>: me: 21f him: 22m

So i've been officially dating my boyfriend for about a month now but have been seeing each other since end of august. Things have been going actually really really good, until I saw something today and it made me upset.

I'm not the kind of girl that likes to argue. I'm a very laid back person but I hate the idea of having some one walk all over me and disrespect me. Therefore, when I feel i'm being disrespected, I try to go about it in the most mature way possible to tell the person that i'm not going to tolerate it.

Unfortunately, sometimes since i'm so easygoing, no one takes me seriously even after the fact of when I like to "tell it like it is".

When my boyfriend does anything on facebook, it is first on my minifeed. I noticed he liked this girls pictures in the past when we weren't dating, but today I saw he liked a new fairly provocative picture of her. 

I immediately got upset and decided to text him saying "can you please not like other girl's pictures on facebook, it is the first thing i see when i log on. I know it's stupid, but it makes me upset"

he answered back "lol okk sorry". I feel like he's kind of showing that he just doesn't take me seriously. He is always nice to me but now i'm just really upset still and I feel like i'm overreacting because i'm petrified of getting hurt again. My ex boyfriend used to do similar things and I would never say anything because I was too timid. 

Reddit, am I being crazy? I don't want to let it bother me and make me worried about things between us, but I can't help but be a little jealous and anxious that he's not taking our relationship seriously.

Give me the gist of the text in a nutshell
<bot>: Bf liked another girls picture on facebook. Texted him asking him please not to do it again because it upsets me. Am i just overreacting? extremely worried that he isn't taking me or the relationship seriously.