Obsessive boy trouble

I’ve been dating a this guy for 6 months now meet in school was always my guy friend would tell him everything when I had no one to go too especially during a tough time of a break up after 4 years with my ex was very difficult and made some mistakes I can’t take bad or regret (sexual) so I told my friend every thing every little detail, but then I fell for him and we started dating was so Fun and sexually adventures couldn’t think what could go wrong was as happy as I have ever been then I didn’t tell him a few things such as meeting unplanned with my guy friend who I did have sexual relations with but not anymore as well as not telling him about texts or calls from him as he didn’t find it comfortable with me talking to him. He became jealous and very obsessive and is still going on but now we fight over little shit such as not calling or texting or telling him where I am what I’m doing and I just don’t know what to do

Help