I don’t think I can handle it anymore..

My SO ex won’t stop texting him. He got a new job today and she texted him congratulations. His grandma told her that he got a new job and stuff. It’s none of her freaking business and when she texted, if I wouldn’t have seen the message I don’t think I would’ve known about it. We’ve been together almost 9 months. I love him so much and we fall asleep together every night. He’s my best friend too. But I just don’t think I can handle it anymore. We’ve been arguing a lot. He threatens to leave all the time. But I know if he does I won’t be able to function correctly. Maybe I’m just afraid of change too. But I do care about him. But I’m just tired of battling. His ex shouldn’t still be texting him. They have no kids together, and I don’t think it’s any of her business where he works. I just can’t do it anymore. It’s killing me and draining me. They knew each other 6 years and were married. So I guess it’s my freaking fault for walking into it all 😭 maybe i should’ve just never bothered. I don’t want him to go. But this just gets to be a lot. Especially when he always threatens to leave, and says he doesn’t care about stuff. It makes me feel like he’s just gonna go back to her if he did leave me... 😭