Do I stay..

So 3 months ago he told me he needed space. He still sleeps in the second bedroom and initiates sex once per week. I confronted him about the whole case last night just saying how I can’t stand this any longer and I need some sort of a conclusion and all he says is to not pressure him. I deff think he is talking to someone else and it breaks my heart. I have severe separation anxiety and I don’t know how to leave. I know I can do better with virtually anyone but I can’t seem to see it. I’m very emotional and I feel I am on the brink of a breakdown. Please help me find happiness.