I can relate that, a lot ♡
This is pretty normal in a new relationship, Building trust of course takes a lot of work. insecurities, anxiety won't leave you alone and it sucks. You get jealous so easily even with his friends even tho he's nothing but been faithful. Just give it some time. It'll work out somehow. And never ever decide with your emotion because the outcome will be most likely terrible. Most important is that both of you need to communicate, it helps a lot.
Manga definitely teached me that COMMUNICATION is the key XD
Reading this was really cute but at the same time got me thinking especially the last few chapters, I've never been in a relationship and one of the reasons is that im the jealous type, im scared of being too "obsessed"(dont like this term but dunno how to put it) and having little trust on the other person...I know that to some extent both need to give (the feeling"you can trust me") but what if I'm too much you know??
Obviously not having experience just makes me think and I dont want to be one of those that need to chain their partner cuz of their insecurities (and I have a lot of those + 0 confidence) sooo ye just wanted to rant a bit XD