My ex and I are in love with one another. He lives in Spain and I live in America. We are going to see one another again in about 3 1/2 months when I go to visit, but I want to be in a relationship with him. Should I recommend an open relationship?

That is something I would never opt for, and I can't recommend it either. You should just accept your relationship for what it is. A friendship.

There was a break-up for a reason. Only you and he know that answer.

You cannot pick up where you left off. During the time that you guys were not together, hopefully you grew up a little bit, became a little wiser about how relationships work.

There isn't any rush, except in your mind. Spend time with him when you go to visit. See what he has learned during this separation.

If you are truly in love with him, and not just the idea of being in a relationship, then you should take it slow. You guys don't even live in the same country, so unless someone is planning a move, you're going to be entering into a Long-Distance-Relationship which will be difficult enough. You can't just get in your car and drive to Spain when you miss him, so you should be thinking about how this will work between you guys. Good luck.