Confused Work Situation

I need some serious advice!! I started working at Lowes about a little over a year and this is where I met my current finance. He great! (at times)Except when I'm out of his sight. If I go to my best friend house and I'm not constantly texting him or talking to him (I only go over when he is working and I'm off) I can't even leave the house without him questioning me. He wasn't like until we got engaged. It is driving me crazy and I talk to him and has laid off a bit but I don't want to get married if is always going to be this way! Please help!!!