LDR Relationship Advice

Sophie
So i have had an on and off relationship with the same guy for honestly about 4 years now. We live in different states as he is in the army and literally never see eachother. Some break ups have been for months and others not so long. We got back together over the holiday period and for both of us it was all that we wanted and it definitely felt different this time, more serious i guess? One part of me says this is everything i want cause i love him obviously but something just feels off and im not sure if its just the distance getting to me. So i guess my question is, How do you know if a relationship has run its course even if you still have feelings for eachother??? 😣😁