Fighting to Stay Married [I Am Married But Lonely]

We've been married for almost a year and a half and together for almost 5 and a half. Things have never been without falter. We're human and neither of us is perfect. But the last couple months, really since covid began it's been rough.

We're at a point now where neither of us want to leave the other, but I'm the only one being affectionate and fighting to keep this marriage together.

He says his mind is just full of various thoughts regarding his previous marriage (how his ex wife treated him), my mother and her negativity (constantly stating my husband would cheat on me with his ex because they do holidays and birthdays together[I'm included]), wanting to move back to his home in the Caribbean but being unable to because of his two kids from his previous marriage... and with all these thoughts in his mind, it has left him feeling empty and heavy and unhappy but unsure how to fix it.

The uncertainty of how to fix his problems has left him distant and more unaffectionate than usual. We have only short conversation except when we talk about where our relationship is going. I just feel the sense of solitude and loneliness. And we sleep in the same bed, come home to each other, have dinner together. I miss my husband...

I'm tempted to leave him. But I love him and the life we have, I want to keep fighting. But I don't know if I can when he is unsure how to fix his issues...