So I've been vetting this potential LTR for any red flags for a bit over a month now. Just found out recently that her she is currently on the same soccer team as her ex boyfriend of 8 months (they broke up 3 months ago). They were friends before on the soccer team then it turned into a relationship and after they broke up they remained on the same soccer team. She told me it wasn't an issue and she'd even leave the team for me because she's so committed to me. Blah blah blah I was still skeptical... Then a week passes by and find out that she is currently liking his Instagram posts as well.

Is this a legitimate thing to be concerned about with a potential LTR or am I reading too much into it?