Can you be in love with more than one person?

So I am very much in love and as with most relationships I am very happy to be part of it though it currently has some very difficult issues.

Every now and then though an ex will pop up in someones news feed or they might like a post I have share, and I think back to them and remember the reasons that I loved them and wonder if you ever truly stop loving those people you have loved before.

Not gone out with or been in a relationship with but those you have loved.