Advice pls

I was with a guy for 6 years. We broke up a few months ago and he got into a relationship with someone else straight away. He introduced her to family and friends did things we used to do then she gave him red flags they were arguing and he finished with her over text then came back to me saying he hadn’t got over our relationship he still loved me and wanted us to try again he had to leave her.

Hes told me I should forget the past and he expects me to just pick up where we left off but I cant do that even though I love him because I cant get over he’s been with someone else. It really hurt me He says I’m being childish about this and he’s not going to wait forever but I told him it will take as long as it takes. We been talking every day and meeting up.

But 2 days ago he started going back to his old ways of when we was together the jelousy and paranoia was showing. He doesnt like me working around males hes always accused me of things I’m not doing and a couple of days ago I dont know how but I called him unknowingly he must have been on the phone about 4 mins and he heard me talking to my colleagues about our Xmas works do where we are meeting etc. There was nothing I was saying that was flirty or out of order.

When I realised I called him I called him back and he wouldn’t answer the phone to me…he kept cutting me off and sending me abusive texts saying your going to have a great night out with ur m8s your narsty your a b**tch and more words like it. I tried to talk to him so many times but he wasn’t having it he’s says he dont trust me..he hates me ..im easy and keeps cutting me off he says he’s glad he heard what he heard now he knows what Im like and that i lead a double life which is wrong.. Honestly I’ve dont nothing wrong.

I was even going to invite him along at one point but the way he’s been carrying on I cant do it..honestly I feel stressed it’s even got to the point of I don’t want to go now. We are not communicating he’s told me to get on with my life and whilst I’m out he’s going to sleep with someone else…seriously my head hurts I feel stressed I need some advice here…