3 month-old plate, super into me. Calls me baby, declares her love, etc.

We go to college together, and many of my friends know her.

Found out through a friend that yesterday marks 1 year with her boyfriend.

Some long-time friends now know as well, and disapprove of what I am doing.

I believe this could impact my relationships with some people, but not sure how to take it.

I'm not really jealous, what she does with him is her choice, but at what point do I cut it? Where is the line between non-needy and doormat? Should people mind their own business or am I wrong and letting her affect my relationships?