My mom is jealous when I love my girlfriend. What to do?

A quick brief. I'm 26, she's 22. She my neighbour and close family friends. We know eachother for 20+ years. She's studying in a different state and I'm working from home. She visit home only once in 2 or 3 months. So We really get eager to meet. Her family is against our relationship because they want her to focus on only studies. (They'll be fine after her graduation).

They don't really like me going alone. So I only go their home with my mom.

But my mom sometimes really get angry If i ask her to come with me or whenever I support her or her family in some matter or if I buy her something. She say things like "you only want her and her family, one day you'll kick me out.." kinda rubbish.

I tried to talk about this, but she's continue to say such things. What can I do?

My mom is jealous when I love my girlfriend. What to do?
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