He may still in fact love her but he definitely does not love their relationship anymore.
Simply put he wants a CHANGE.
He wants to spend (less time) with her.
Normally when two people are growing in the same direction they plan for (a life together) not apart.
Today it’s very common for couples to use the term “Trial Separation” which is nothing more than a “practice breakup” in my opinion. Someone wants to test the waters of singlehood while keeping their mate on the line in case things don’t pan out. Awhile back I wrote a hub on this.
My advice is walk away from the relationship.
Life is short. It’s important that each us of places a high value on our time.
No one has time to waste sitting around trying to “figure out” what someone else wants.
Love alone is not enough to substain a relationship. You have to want the same thing!
If a person wants to be in a loving committed relationship then they need to be with someone who wants the same thing!
You can always drop each other line now and then if you are incline to remain friends.