At the start of the play, we don't know how John feels about Abigail. In the first act, he spends time with her and is kind to her, but he also makes it obvious that he will not rekindle their affair. This revelation seemed to imply that if John ever loved Abigail, he loved Elizabeth far more. In fact, later on in the play we learn that John has married Elizabeth! It's possible that John loves both women but can't commit to either one. Or perhaps he loves them both equally but only wants to be with one at a time. The play doesn't tell us how he feels so we'll never know for sure. As for Abigail and John, they seem very much in love at the beginning of the play. They talk about having a future together and plan to run away together after John receives his inheritance. However, once John learns that she's been sleeping with Dan Rowland, he dumps her without a second thought. It's safe to say that John no longer loves Abigail and has no intention of starting again with her. Thus, we can conclude that yes, John Proctor is still in love with Elizabeth Howe even though she's been married to another man for several years now.