If you really loved him, you wouldn't lie to him. Whatever you do to try and convince him you are a virgin, you will be living a lie, and one day he may well find out - then what? He may even find out from your ex.
Is he a virgin?
What are the cultural and religious implications of this? Where are you from, and how old are you?
You need to think carefully about why you had sex with your ex, and also why it was only two times. How long ago did this happen?
Remember what you said on your other post https://www.steadyhealth.com/I_want_to_have_sex_t197734.html#1382918
You are no longer a virgin, and never will be again. It may be that the guy is wanting to marry a virgin, or maybe he just wants to have sex with a virgin.
If you don't want to tell him you're not a virgin, don't tell him. That's your business.
First off, do some kegel exercises (the muscles you use to stop yourself from peeing - Google it) to keep your vaginal muscles feeling tight. When you are having sex with him, ask him to go slow and easy and act like it hurts a little, as if it is your first time.
If he loves you he shouldn't care if you're a virgin or not. Just make sure you use a condom every time!
If she refuses to tell him that she's not a virgin, the implication is that she is not. If she categorically says she is a virgin, then that would by lying - that is no sensible way to conduct a relationship. Trust in a relationship is important, and if virginity is culturally or religiously important to him, then that is a factor to consider regarding continuing the relationship.
Furthermore, you need to be sensitive to the individual's culture or religion. He can love her but still have certain expectations. If she loves him, she should respect his expectations, and expect him to respect hers.
However, it may be that he just wants to take her virginity, and then move on to the next virgin (as some do).