Help me I’m ruining my relationship with him?

I’m 23. My boyfriend 28. When me and my boyfriend went on a break he started seeing this girl, he met her twice. Obviously it hurts me but what can I say.

We are back together now and she is really frustrating me, trying to text him, chasing him, not letting him go. I get it’s not her fault and more his for leading her on but it’s really affecting my mental health and it sounds so immature that I’m letting another woman affects this. I’ve told her to block him and he has but she’s constantly posting digs about me and how she’s hurt or even then she will post his initial with a heart then delete it and post how sad she is. I get it’s not her fault and also his but obviously since I love him and I don’t know her and she lives 4 hours away it’s really effecting me.

I keep mentioning her everyday, it’s been 1 month maybe almost 2 and I still keep bringing her up. He keeps saying he’s sorry and how I need to forget and overcome this and stop caring about her and stop viewing her profile because it just is pushing me away., I am finding it really hard to get over. I don’t know what to do. I actually want to break up with him over this because it’s making me feel sad knowing someone had my boyfriend for a bit and still cares about him. We keep arguing everyday. He’s saying I need to grow up and forget about other females who he made a mistake with and who he does not care about but I’m finding this hard. I’m a mom, my son is 10 months so I’m still on maternity leave and I just find it hard sitting at home, I do miss work and a distraction. :(

Help me I’m ruining my relationship with him?
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