I'm jealous and I don't know how to change?

So I've been dating my boyfriend for a year and a half. He's a senior I'm a junior. I never use to be jealous or needy. But after some drama about a girl kissing him and he lied and hid somthing from me for months (he did drugs) Ive realized I'm totally insane!! I'm supper jealous and clingy I always text him "who are u with" and what they are doing to ease my anxiety. I don't trust him w a certain group of friends (he works at chick fil a and he has a group of workers that are his good friends). The first time he was associated to be in the group they got drunk and he ended up not texting me until 2 am when I was freaking out because he never gets drunk and he said he was going to text me. The other time he hung out w them he went to white water w a bunch of girls and few guys and I was extremely jealous. He went from 11am-7pm then went to someone's house to hangout till 11pm. My parents don't let us hangout so I barely see him, maybe 3 times a month MAX. what can I do ? What can he do to maybe calm my clingyness?? I hate it Ive always been so easy going...