It seems like Teen Mom stars Catelynn Lowell and Tyler Baltierra have been together forever, but their relationship hasn’t been without plenty of bumps in the road. As they expect their third daughter and work through a temporary separation, things are particularly messy. In fact, fans suspected that the MTV father had even ditched his wedding ring — so where do they stand now? Check out the gallery below to see a complete timeline of Catelynn and Tyler’s relationship.