Longtime female friend I like might have a boyfriend but she still hangs out with me alone?

So, this girl I like, whom I’ve been friends with for many years, hangs out with me on many occasions. We have private dinners together and we go out and do things together. But on social media I’ve seen some things that make me think she has a boyfriend and may have had one for a while. She never mentioned him or has disclosed that she’s in a relationship. In the past she’s been candid about her relationships. I feel like I’m just on a very confusion situation, I’m afraid to flat out ask but I also am feeling uncomfortable hanging out with her when she might have a boyfriend. Any advice or insight is very much appreciated, thank you.
Longtime female friend I like might have a boyfriend but she still hangs out with me alone?
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