This is the biggest thing.
I don’t think you can just walk into this expecting for your boyfriend’s mom to love you. Maybe that’s how it worked back in high school, but come on, this is the real world now.
If you want your boyfriend’s mom to love you, work for it. Don’t be some MIA girlfriend. Show up and put your best effort forward. Prove that you’re the right girl for your boyfriend and the right girl for that family.
Hearing stories of awful mother-in-laws is scary, work to avoid that with your boyfriend’s mom. The effort you put into the relationship with her, and with her son, will really pay off. Relationships are hard enough already, don’t add extra stress with family drama.