So, to give a little back story, there's a man who's a vendor at work, I see him almost every day. He's a little older than I am, and he used to be kind of flirtatious and overstepped the boundaries when I wanted to be left alone. But before that we got along very well, as friends and nothing more. I had him on Facebook and left a conversation up between us. My boyfriend got angry even though it was honestly nothing bad.
I blocked and deleted him out of respect for my boyfriend. But we still remained friends at work. It was a vulnerable time in my life and I was going to break up with my boyfriend. We ended up working things out.
I got pregnant a fwe months later and turned into a total ***** at work, and I got him in trouble at work, nothing huge, just further asking the bosses to ask him to leave me alone.

So about a week ago, almost a year since I last spoke with the man I work with, I apologized, told him he wasn't a bad guy and I was miserable being pregnant. He accepted and we've been on good terms. My boyfriend doesn't like him to this day. And today I got out 2 1/2 hrs early and I called my bpyfriend, phone was dead, messaged him on facebook, didn't answer. Called my grandmother, where he was supposed to be, he wasn't there. So the man I work with and I always have joked around withe each other and not entirely serious I messaged him ' hey wanna bring me home I'm stuck at work for a few hrs..no.I'm just kidding I'm just bored and I know I'll be here for a while, saying hi' but he really offered to bring me home, which was tit all out of the way for him and was very nice, so I stuck around until he came. My boyfriend finally messages me as I'm waiting and I say no its okay someone from works giving me a ride..not usually a big deal. I wasn't about to make my ride turn around half way after working plans around me, having to backtrack to pick up his kids from school...etc. so he brought me home and my be asks exactly who it is giving me a ride, I didn't see until I got home. But that's not usually like him to press it. So I figure, hey, my tablet should have the stupid little chat heads on it, right ? Nope.
Meaning, my bf went thru my messages and expected me to try to lie to him.
Since day 1 of pregnancy, my be has playfully accused me of cheating, straight out asked me if it was his, made jokes about the baby coming out black (the man I work with is black)
He's been extremely negative lately now too, and still continuously does all of those things. I can't take it anymore because I wouldn't leave my stuff out in the open if I had something to hide, I have never lied to him, I told him who gave me the ride, and I've never once cheated.
Now he's acting all weird toward me and superior needy trying to grope me literally every single friggn chance he gets, and its just irritating.
so I'm not sure how to treat this situation.