Should I let my one year old get up if he won't go to sleep in the evening?

[Azquilith]

My one year old co sleeps and has always breastfed to sleep. A few months ago we bought a cot and I would feed him to sleepy on the bed, put him in cot then in with us when we went to bed.
However recently that has not worked, he just doesn't seem tired at bedtime (7.30/8) and I have two options - putting him in cot and leaving him to cry (he went for an hour and a half once till I broke) or lying on the bed with him for 1-2 hours while he crawls around and chats to me. For the last few weeks I have been feeding him at normal time, but after ten minutes he finishes, gets himself off the bed, opens the door and trots off down the hall to find Dad as awake as anything. I let him get up then try him again later but I don't think I'm doing the right thing.
If I don't want to let him cry should I be staying in the room with him indefinitely? He has one sleep during the day at about 1pm for 1.5 hours and a bedtime routine of bath, jammies then breastfeed in dark bedroom.
Help!

I let my daughter get up or stay with her and read books,

If my daughter does this is usually because she's overtired and I've missed her window.

Try bringing bedtime earlier?

If his nap finishes at 2.30, I think he needs to be going down by 7.

I'd say he'll probably still need 2 naps, not many babies drop to 1 nap before 16monts. If needs it be one nap for childcRe bring bedtime forward.

Consider quiet activities. Looking at books about bedtime together, quietly telling him about your day, cuddling teddies. Nothing to stimulating - focus on teaching your ds to relax and fall asleep by himself. No TV but lullabies on CD player always worked for my 2 dc.

Thank you really helpful, hadn't considered that he might be overtired.

If our son, 13 months won't settle I do bring him down and try again later. Usually it's overtiredness when he won't settle. Oddly waiting an hour and trying again usually works. Saves me being stuck in the bedroom for ages slowly getting frustrated - which is never going to help LO get to sleep.