Iffy about posting this but.....

Alright ladies. I am 17 and 21 weeks pregnant and me and my boyfriend couldn't be happier but today out of the blue a guy I considered to be a close friend texted me. My BF then said he had to leave and got very angry with me. He wouldn't tell me until I blew up his phone and then threatened to be "done" with our relationship. This isnt the first time he's done this. I love him with all my heart but he is always accusing me of lying or talking to other guys. He has had a rough past with other girls but I am his longest relationship and we are having a child together.... Any advice or words of wisdom to help Me out?