I Think my Ex is a Lesbian

We've been no contact for about three weeks now but I keep looking at their social media. YES, I KNOW I SHOULDNT BUT ITS TOO LATE NOW.

Anyways, she keeps posting stuff about being a lesbian and being attracted to women now. She had always been attracted to women before but I'm afraid this has completely killed any chance of reconciliation or getting back together in the future.

While we were together, I knew she loved me, wholly and honestly. What's going on? Is this just something they have to explore? The breakup was really blindsiding and they didn't say anything about being a lesbian when they left.