Do you believe a trans person and a cis person can have a lasting (monogamous) relationship ?

Well I just got my (trans, man) heart crushed by my ex (cis, woman). This has me really wondering if a (cis) woman could ever actually be satisfied with me long term... Or if she will always just go looking for other men. Perhaps the most I can realistically hope for is short-term fun with these non-trans women. Shit really hurts...my dumbass had proposed to her too. But yeah... Anybody ever seriously thought about this question? What do you think.