Am I crazy?

My husband use to have this girl friend he was close to before we met. He went out partying with her every night, getting drunk all the time. When we started dating and things got more serious he stopped going out and wanted to grow up a bit I guess. They grew apart bc she felt he was changing all for me and she didn’t think he would marry me. Well we got married a year ago and my husband doesn’t really got partying anymore and it’s not bc of me but he wants to be more of a family man and wants to be seen more mature now, we have our first baby on the way so he’s just wanting to settle into married/dad life. A couple of times though she has called him at like 3am and of course he’s sleeping but the vibration wakes me up and I see her name. He doesn’t return the call or text her, he just brushes it off. She’s called him while we were out to dinner asking him if he can give her a ride somewhere and when he told her no he’s out with his wife she got mad and said he’s with me all the time why can’t he just hang out with her for a little. He hung up on her. Last night I got home late from work and was up with our puppy and I heard his phone ringing at 2am. His grandparents have been sick so I was worried it was one of his family members telling us something bad had happened to them but nope it was her. I asked my husband why she was calling him at 2am and he just brushed it off and said he didn’t know. I asked him if he could kindly tell her it’s not right to be calling a married man in the middle of the night and if she can stop. My husband agreed with no hesitation but I just know she will try to make me seem like i’m crazy. Should I just have let it go?